/* ============================================================
   styles.css — VoidChat
   DARK:  Linear / Modern dark (default)
   LIGHT: Hand-drawn sketch / Paper aesthetic
   Fonts: Orbitron + IBM Plex Mono (dark) | Kalam + Patrick Hand (light)
   ============================================================ */

@import url("https://fonts.googleapis.com/css2?family=Orbitron:wght@400;600;800&family=IBM+Plex+Mono:wght@300;400;500&family=Kalam:wght@400;700&family=Patrick+Hand&display=swap");

/* ── Reset ─────────────────────────────────────────────────── */

*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

/* 
══════════════════════════════════════════════════════════════
   DARK THEME (default / [data-theme="dark"])
══════════════════════════════════════════════════════════════
*/

:root,
[data-theme="dark"] {
    --bg: #050506;
    --void: #020203;
    --deep: #0a0a0c;
    --surface: rgba(255, 255, 255, 0.05);
    --surface-md: rgba(255, 255, 255, 0.08);
    --surface-hi: rgba(255, 255, 255, 0.13);
    --border: rgba(255, 255, 255, 0.06);
    --border-hi: rgba(94, 106, 210, 0.4);

    --plasma: #5e6ad2;
    --plasma-lo: #3d4799;
    --pulse: #818cf8;
    --pulse-lo: #4f57b8;
    --danger: #f87171;

    --text-hi: #ededef;
    --text-md: #8a8f98;
    --text-lo: #44485a;

    --blur: blur(20px);
    --blur-sm: blur(12px);

    --radius: 10px;
    --radius-lg: 16px;
    --radius-pill: 999px;
    --radius-form: 8px;

    --font-display: "Orbitron", sans-serif;
    --font-body: "IBM Plex Mono", monospace;

    --shadow-card:
        0 0 0 1px rgba(255, 255, 255, 0.06), 0 4px 24px rgba(0, 0, 0, 0.5),
        0 0 60px rgba(0, 0, 0, 0.3);
    --shadow-card-hover:
        0 0 0 1px rgba(255, 255, 255, 0.1), 0 8px 40px rgba(0, 0, 0, 0.6),
        0 0 80px rgba(94, 106, 210, 0.12);
    --shadow-btn:
        0 0 0 1px rgba(94, 106, 210, 0.5), 0 4px 14px rgba(94, 106, 210, 0.35),
        inset 0 1px 0 rgba(255, 255, 255, 0.15);
    --shadow-btn-hover:
        0 0 0 1px rgba(94, 106, 210, 0.7), 0 6px 24px rgba(94, 106, 210, 0.5),
        inset 0 1px 0 rgba(255, 255, 255, 0.2);

    --modal-bg: rgba(2, 2, 3, 0.8);
    --loading-bg: rgba(2, 2, 3, 0.88);

    --toggle-bg: rgba(255, 255, 255, 0.07);
    --toggle-border: rgba(255, 255, 255, 0.1);
    --toggle-color: #ededef;
    --toggle-shadow:
        0 0 0 1px rgba(255, 255, 255, 0.06), 0 4px 16px rgba(0, 0, 0, 0.4);
}

/* ══════════════════════════════════════════════════════════════
   LIGHT / SKETCH THEME ([data-theme="light"])
   ══════════════════════════════════════════════════════════════ */

[data-theme="light"] {
    --bg: #fdfbf7;
    --void: #fdfbf7;
    --deep: #f5f0e8;
    --surface: rgba(255, 255, 255, 0.92);
    --surface-md: rgba(255, 255, 255, 0.98);
    --surface-hi: rgba(255, 255, 255, 1);
    --border: #2d2d2d;
    --border-hi: #ff4d4d;

    --plasma: #ff4d4d;
    --plasma-lo: #cc3333;
    --pulse: #2d5da1;
    --pulse-lo: #1a3d6e;
    --danger: #ff4d4d;

    --text-hi: #2d2d2d;
    --text-md: #555555;
    --text-lo: #999999;

    --blur: blur(0px);
    --blur-sm: blur(0px);

    /* Wobbly border-radii — the soul of the sketch theme */
    --radius: 8px 3px 6px 3px / 3px 6px 3px 8px;
    --radius-lg: 255px 15px 225px 15px / 15px 225px 15px 255px;
    --radius-pill: 180px 10px 160px 10px / 10px 160px 10px 180px;
    --radius-form: 10px 3px 8px 3px / 3px 8px 3px 10px;

    --font-display: "Kalam", cursive;
    --font-body: "Patrick Hand", cursive;

    --shadow-card: 5px 5px 0px 0px #2d2d2d;
    --shadow-card-hover: 7px 7px 0px 0px #2d2d2d;
    --shadow-btn: 4px 4px 0px 0px #2d2d2d;
    --shadow-btn-hover: 2px 2px 0px 0px #2d2d2d;

    --modal-bg: rgba(253, 251, 247, 0.85);
    --loading-bg: rgba(253, 251, 247, 0.92);

    --toggle-bg: #ffffff;
    --toggle-border: #2d2d2d;
    --toggle-color: #2d2d2d;
    --toggle-shadow: 3px 3px 0px 0px #2d2d2d;
}

/* ── Smooth theme transitions ───────────────────────────────── */

html.theme-switching *,
html.theme-switching *::before,
html.theme-switching *::after {
    transition:
        background-color 0.35s ease,
        background 0.35s ease,
        color 0.35s ease,
        border-color 0.35s ease,
        box-shadow 0.35s ease,
        opacity 0.35s ease !important;
}

/* ── Base ──────────────────────────────────────────────────── */

html,
body {
    height: 100%;
    overflow: hidden;
}

body {
    font-family: var(--font-body);
    font-size: 14px;
    color: var(--text-hi);
    background: var(--bg);
    position: relative;
}

/* ── DARK: Layered ambient background ──────────────────────── */

[data-theme="dark"] body::before {
    content: "";
    position: fixed;
    inset: 0;
    background:
        radial-gradient(
            ellipse 90% 70% at 50% -15%,
            rgba(94, 106, 210, 0.22) 0%,
            transparent 65%
        ),
        radial-gradient(
            ellipse 60% 50% at 85% 85%,
            rgba(94, 106, 210, 0.1) 0%,
            transparent 55%
        ),
        radial-gradient(
            ellipse 50% 50% at 5% 95%,
            rgba(94, 106, 210, 0.08) 0%,
            transparent 55%
        ),
        radial-gradient(
            ellipse 40% 30% at 60% 50%,
            rgba(130, 140, 255, 0.05) 0%,
            transparent 50%
        ),
        radial-gradient(
            ellipse 100% 100% at 50% 50%,
            #0a0a0c 0%,
            #050506 50%,
            #020203 100%
        );
    z-index: 0;
    pointer-events: none;
    animation: ambientShift 12s ease-in-out infinite alternate;
}

@keyframes ambientShift {
    0% {
        opacity: 0.85;
    }
    100% {
        opacity: 1;
    }
}

/* DARK: Subtle grid overlay */
[data-theme="dark"] body::after {
    content: "";
    position: fixed;
    inset: 0;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.018) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.018) 1px, transparent 1px);
    background-size: 64px 64px;
    z-index: 0;
    pointer-events: none;
    animation: twinkle 8s ease-in-out infinite alternate;
}

@keyframes twinkle {
    0% {
        opacity: 0.5;
    }
    100% {
        opacity: 1;
    }
}

/* ── LIGHT: Paper texture background ───────────────────────── */

[data-theme="light"] body::before {
    content: "";
    position: fixed;
    inset: 0;
    background-image: radial-gradient(#d8d0c8 1px, transparent 1px);
    background-size: 24px 24px;
    background-color: #fdfbf7;
    z-index: 0;
    pointer-events: none;
    animation: none;
}

[data-theme="light"] body::after {
    content: "";
    position: fixed;
    inset: 0;
    /* faint horizontal rule lines like notebook paper */
    background-image: repeating-linear-gradient(
        transparent,
        transparent 27px,
        rgba(180, 165, 140, 0.18) 28px
    );
    z-index: 0;
    pointer-events: none;
    animation: none;
}

/* ── Typography ────────────────────────────────────────────── */

h1,
h2,
h3 {
    font-family: var(--font-display);
    letter-spacing: 0.04em;
}

[data-theme="light"] h1,
[data-theme="light"] h2,
[data-theme="light"] h3 {
    letter-spacing: 0.01em;
}

/* ── Glass / Paper card ─────────────────────────────────────── */

.glass {
    background: var(--surface);
    backdrop-filter: var(--blur);
    -webkit-backdrop-filter: var(--blur);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-card);
}

[data-theme="light"] .glass {
    background: #ffffff;
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
    border: 2px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-card);
}

/* ── Page wrapper ──────────────────────────────────────────── */

.page {
    position: relative;
    z-index: 1;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
}

/* ══════════════════════════════════════════════════════════════
   THEME TOGGLE BUTTON
   ══════════════════════════════════════════════════════════════ */

#theme-toggle {
    position: fixed;
    top: 16px;
    right: 16px;
    z-index: 500;
    background: var(--toggle-bg);
    border: 1px solid var(--toggle-border);
    border-radius: var(--radius-pill);
    color: var(--toggle-color);
    cursor: pointer;
    font-family: var(--font-body);
    font-size: 0.72rem;
    font-weight: 500;
    letter-spacing: 0.06em;
    padding: 8px 14px;
    display: flex;
    align-items: center;
    gap: 7px;
    box-shadow: var(--toggle-shadow);
    transition:
        transform 0.15s ease,
        box-shadow 0.15s ease;
    backdrop-filter: var(--blur-sm);
    -webkit-backdrop-filter: var(--blur-sm);
    white-space: nowrap;
}

#theme-toggle:hover {
    transform: translateY(-2px);
}

[data-theme="light"] #theme-toggle:hover {
    transform: translate(2px, -2px);
    box-shadow: 5px 5px 0px 0px #2d2d2d;
}

#theme-toggle:active {
    transform: translateY(0);
}

[data-theme="light"] #theme-toggle:active {
    transform: translate(3px, 3px);
    box-shadow: 1px 1px 0px 0px #2d2d2d;
}

.theme-toggle__icon {
    font-size: 0.9rem;
    line-height: 1;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.4s ease;
}

#theme-toggle:hover .theme-toggle__icon {
    transform: rotate(20deg);
}

.fa-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.form-title .fa-icon {
    margin-right: 0.7rem;
    font-size: 1.05rem;
}

.btn i,
.theme-toggle__icon i,
.invite-toggle i,
.admin-badge i,
.msg__file-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.msg__file-icon {
    margin-right: 0.35rem;
    font-size: 0.98rem;
}

/* ══════════════════════════════════════════════════════════════
   INDEX PAGE — LANDING
   ══════════════════════════════════════════════════════════════ */

.landing-wrap {
    width: 100%;
    max-width: 460px;
    display: flex;
    flex-direction: column;
    gap: 24px;
    animation: fadeUp 0.5s ease both;
}

@keyframes fadeUp {
    from {
        opacity: 0;
        transform: translateY(24px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ── Brand ─────────────────────────────────────────────────── */

.brand {
    text-align: center;
}

.brand__logo {
    font-family: var(--font-display);
    font-size: 2.4rem;
    font-weight: 800;
    letter-spacing: 0.1em;

    /* dark: gradient text */
    background: linear-gradient(135deg, var(--plasma) 0%, var(--pulse) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

[data-theme="light"] .brand__logo {
    /* light: solid ink text with slight tilt personality */
    background: none;
    -webkit-text-fill-color: var(--text-hi);
    background-clip: unset;
    color: var(--text-hi);
    display: inline-block;
    transform: rotate(-1.5deg);
    text-shadow: 3px 3px 0px rgba(255, 77, 77, 0.2);
    letter-spacing: 0.06em;
}

.brand__sub {
    margin-top: 6px;
    color: var(--text-md);
    font-size: 0.78rem;
    font-family: var(--font-body);
    letter-spacing: 0.08em;
}

[data-theme="light"] .brand__sub {
    font-size: 0.82rem;
    letter-spacing: 0.04em;
}

/* ── Enc badge ─────────────────────────────────────────────── */

.enc-badge {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 7px;
    font-size: 0.68rem;
    font-family: var(--font-body);
    color: var(--text-lo);
    letter-spacing: 0.06em;
    margin-top: -8px;
}

.enc-badge-dot {
    width: 6px;
    height: 6px;
    background: var(--pulse);
    border-radius: 50%;
    box-shadow: 0 0 6px var(--pulse);
    animation: blink 2s ease-in-out infinite;
    flex-shrink: 0;
}

[data-theme="light"] .enc-badge-dot {
    box-shadow: none;
    border: 1.5px solid var(--pulse);
    background: var(--pulse);
}

@keyframes blink {
    0%,
    100% {
        opacity: 1;
    }
    50% {
        opacity: 0.3;
    }
}

/* ── Tab switcher ──────────────────────────────────────────── */

.tab-bar {
    display: flex;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-pill);
    padding: 4px;
    gap: 2px;
    backdrop-filter: var(--blur-sm);
    -webkit-backdrop-filter: var(--blur-sm);
}

[data-theme="light"] .tab-bar {
    background: #f5f0e8;
    border: 2px solid var(--border);
    border-radius: var(--radius-pill);
    backdrop-filter: none;
    box-shadow: 3px 3px 0px 0px #2d2d2d;
    padding: 5px;
}

.tab-btn {
    flex: 1;
    padding: 9px 0;
    border: none;
    background: transparent;
    color: var(--text-md);
    font-family: var(--font-display);
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    cursor: pointer;
    border-radius: var(--radius-pill);
    transition: all 0.22s ease;
}

.tab-btn.active {
    background: linear-gradient(135deg, var(--plasma-lo), var(--plasma));
    color: #fff;
    box-shadow: var(--shadow-btn);
}

[data-theme="light"] .tab-btn {
    font-size: 0.8rem;
    letter-spacing: 0.04em;
    border-radius: var(--radius-pill);
}

[data-theme="light"] .tab-btn.active {
    background: var(--plasma);
    color: #fff;
    box-shadow: 3px 3px 0px 0px #2d2d2d;
}

.tab-panel {
    display: none;
}
.tab-panel.active {
    display: block;
}

/* ── Form card ─────────────────────────────────────────────── */

.form-card {
    padding: 28px 28px 24px;
}

.form-title {
    font-size: 1rem;
    font-weight: 700;
    font-family: var(--font-display);
    color: var(--plasma);
    margin-bottom: 22px;
    letter-spacing: 0.06em;
}

[data-theme="light"] .form-title {
    font-size: 1.15rem;
    letter-spacing: 0.01em;
    transform: rotate(-0.5deg);
    display: inline-block;
}

/* ── Fields ────────────────────────────────────────────────── */

.field {
    display: flex;
    flex-direction: column;
    gap: 5px;
    margin-bottom: 16px;
}

.field label {
    font-size: 0.7rem;
    font-family: var(--font-body);
    color: var(--text-md);
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

[data-theme="light"] .field label {
    font-size: 0.78rem;
    letter-spacing: 0.04em;
    text-transform: none;
    font-weight: 400;
}

.field input {
    background: var(--surface-md);
    border: 1px solid var(--border);
    border-radius: var(--radius-form);
    padding: 11px 14px;
    color: var(--text-hi);
    font-family: var(--font-body);
    font-size: 0.9rem;
    outline: none;
    transition:
        border-color 0.2s,
        box-shadow 0.2s;
    width: 100%;
    -webkit-box-shadow: none;
}

.field input:focus {
    border-color: var(--plasma);
    box-shadow: 0 0 0 3px rgba(94, 106, 210, 0.15);
}

[data-theme="light"] .field input {
    background: #fdfbf7;
    border: 2px solid #2d2d2d;
    border-radius: var(--radius-form);
    box-shadow: 2px 2px 0px 0px #2d2d2d;
}

[data-theme="light"] .field input:focus {
    border-color: var(--pulse);
    box-shadow: 3px 3px 0px 0px var(--pulse);
    outline: none;
}

.field input.input--error {
    border-color: var(--danger);
    box-shadow: 0 0 0 3px rgba(255, 79, 109, 0.12);
}

[data-theme="light"] .field input.input--error {
    border-color: var(--danger);
    box-shadow: 2px 2px 0px 0px var(--danger);
}

.field input::placeholder {
    color: var(--text-lo);
}

.field-error {
    display: none;
    font-size: 0.72rem;
    font-family: var(--font-body);
    color: var(--danger);
    margin-top: 2px;
}

/* ── Buttons ───────────────────────────────────────────────── */

.btn {
    border: none;
    cursor: pointer;
    font-family: var(--font-display);
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    border-radius: var(--radius-pill);
    padding: 12px 22px;
    transition: all 0.18s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 7px;
    white-space: nowrap;
}

[data-theme="light"] .btn {
    font-size: 0.85rem;
    letter-spacing: 0.04em;
}

/* Primary */
.btn--primary {
    background: var(--plasma);
    color: #fff;
    width: 100%;
    padding: 14px;
    margin-top: 4px;
    box-shadow: var(--shadow-btn);
}

[data-theme="dark"] .btn--primary {
    background: linear-gradient(135deg, var(--plasma-lo), var(--plasma));
}

.btn--primary:hover {
    box-shadow: var(--shadow-btn-hover);
    transform: translateY(-2px);
}

[data-theme="light"] .btn--primary {
    background: var(--plasma);
    border: 2px solid #2d2d2d;
    border-radius: var(--radius-pill);
    box-shadow: 4px 4px 0px 0px #2d2d2d;
    transform: none;
}

[data-theme="light"] .btn--primary:hover {
    background: #e63333;
    box-shadow: 2px 2px 0px 0px #2d2d2d;
    transform: translate(2px, 2px);
}

.btn--primary:active {
    transform: translateY(0) scale(0.99);
    box-shadow:
        0 0 0 1px rgba(94, 106, 210, 0.4),
        0 1px 4px rgba(94, 106, 210, 0.2);
}

[data-theme="light"] .btn--primary:active {
    transform: translate(4px, 4px);
    box-shadow: 0px 0px 0px 0px #2d2d2d;
}

.btn--primary:disabled {
    opacity: 0.45;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

/* Ghost */
.btn--ghost {
    background: var(--surface-md);
    border: 1px solid var(--border);
    color: var(--text-md);
}

.btn--ghost:hover {
    background: var(--surface-hi);
    color: var(--text-hi);
}

[data-theme="light"] .btn--ghost {
    background: #fff;
    border: 2px solid #2d2d2d;
    border-radius: var(--radius);
    box-shadow: 3px 3px 0px 0px #2d2d2d;
    color: #2d2d2d;
}

[data-theme="light"] .btn--ghost:hover {
    transform: translate(1px, 1px);
    box-shadow: 2px 2px 0px 0px #2d2d2d;
    background: #f5f0e8;
}

/* Danger */
.btn--danger {
    background: rgba(248, 113, 113, 0.12);
    border: 1px solid rgba(248, 113, 113, 0.35);
    color: var(--danger);
}

.btn--danger:hover {
    background: rgba(248, 113, 113, 0.22);
    box-shadow: 0 0 16px rgba(248, 113, 113, 0.2);
}

[data-theme="light"] .btn--danger {
    background: rgba(255, 77, 77, 0.08);
    border: 2px solid var(--danger);
    border-radius: var(--radius);
    box-shadow: 3px 3px 0px 0px var(--danger);
    color: var(--danger);
}

[data-theme="light"] .btn--danger:hover {
    transform: translate(1px, 1px);
    box-shadow: 2px 2px 0px 0px var(--danger);
    background: rgba(255, 77, 77, 0.15);
}

/* Icon button */
.btn--icon {
    background: var(--surface-md);
    border: 1px solid var(--border);
    color: var(--text-md);
    width: 38px;
    height: 38px;
    padding: 0;
    font-size: 1rem;
    border-radius: var(--radius);
    font-family: inherit;
}

.btn--icon:hover {
    background: var(--surface-hi);
    color: var(--plasma);
    border-color: var(--border-hi);
}

[data-theme="light"] .btn--icon {
    background: #fff;
    border: 2px solid #2d2d2d;
    border-radius: var(--radius);
    box-shadow: 2px 2px 0px 0px #2d2d2d;
    color: #2d2d2d;
}

[data-theme="light"] .btn--icon:hover {
    transform: translate(1px, 1px);
    box-shadow: 1px 1px 0px 0px #2d2d2d;
    color: var(--plasma);
}

/* Send button */
.btn--send {
    background: var(--plasma);
    color: #fff;
    width: 42px;
    height: 42px;
    padding: 0;
    border-radius: var(--radius);
    font-size: 1.1rem;
    font-family: inherit;
    box-shadow: var(--shadow-btn);
    flex-shrink: 0;
}

[data-theme="dark"] .btn--send {
    background: linear-gradient(135deg, var(--plasma-lo), var(--plasma));
}

.btn--send:hover {
    box-shadow: var(--shadow-btn-hover);
    transform: scale(1.04);
}

[data-theme="light"] .btn--send {
    background: var(--plasma);
    border: 2px solid #2d2d2d;
    border-radius: var(--radius);
    box-shadow: 3px 3px 0px 0px #2d2d2d;
}

[data-theme="light"] .btn--send:hover {
    transform: translate(1px, 1px);
    box-shadow: 2px 2px 0px 0px #2d2d2d;
}

/* Kick button */
.btn--kick {
    background: transparent;
    border: none;
    color: var(--text-lo);
    cursor: pointer;
    font-size: 0.75rem;
    padding: 2px 5px;
    border-radius: 4px;
    transition: color 0.15s;
    margin-left: auto;
    font-family: inherit;
}

.btn--kick:hover {
    color: var(--danger);
}

/* ══════════════════════════════════════════════════════════════
   CHAT PAGE
   ══════════════════════════════════════════════════════════════ */

.chat-layout {
    position: relative;
    z-index: 1;
    height: 100vh;
    height: 100dvh; /* dvh shrinks when the virtual keyboard opens — 100vh does not */
    display: grid;
    grid-template-columns: 1fr;
    grid-template-rows: 56px 1fr 68px;
    grid-template-areas:
        "header"
        "messages"
        "input";
    overflow: hidden;
}

/* ── Header ────────────────────────────────────────────────── */

.chat-header {
    grid-area: header;
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 0 20px;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    backdrop-filter: var(--blur-sm);
    -webkit-backdrop-filter: var(--blur-sm);
}

[data-theme="light"] .chat-header {
    background: rgba(255, 255, 255, 0.95);
    border-bottom: 2px solid var(--border);
    backdrop-filter: none;
}

.chat-header__room {
    flex: 1;
    font-family: var(--font-display);
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--plasma);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.header-actions {
    display: flex;
    gap: 8px;
}

/* ── Sidebar ───────────────────────────────────────────────── */

.chat-sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: min(320px, 92vw);
    max-width: 340px;
    height: 100%;
    display: flex;
    flex-direction: column;
    background: rgba(5, 5, 6, 0.94);
    border-right: 1px solid var(--border);
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
    overflow: hidden;
    transform: translateX(-112%);
    transition:
        transform 0.28s ease,
        opacity 0.28s ease;
    opacity: 0;
    z-index: 100;
    box-shadow: 0 30px 70px rgba(0, 0, 0, 0.28);
}

[data-theme="light"] .chat-sidebar {
    background: rgba(255, 255, 255, 0.96);
}

.chat-sidebar.open {
    transform: translateX(0);
    opacity: 1;
}

[data-theme="light"] .chat-sidebar {
    background: rgba(253, 251, 247, 0.97);
    border-right: 2px solid var(--border);
    backdrop-filter: none;
}

#sidebar-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.28);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.25s ease;
    z-index: 80;
}

#sidebar-backdrop.visible {
    opacity: 1;
    pointer-events: auto;
}

.sidebar-header {
    padding: 16px 16px 12px;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    gap: 8px;
}

[data-theme="light"] .sidebar-header {
    border-bottom: 2px solid var(--border);
}

.sidebar-logo {
    font-family: var(--font-display);
    font-size: 0.85rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--plasma), var(--pulse));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: 0.08em;
}

[data-theme="light"] .sidebar-logo {
    background: none;
    -webkit-text-fill-color: var(--text-hi);
    color: var(--text-hi);
    letter-spacing: 0.03em;
}

.sidebar-section {
    padding: 12px 16px 8px;
}

.sidebar-label {
    font-size: 0.62rem;
    font-family: var(--font-body);
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--text-lo);
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 5px;
}

[data-theme="light"] .sidebar-label {
    font-size: 0.7rem;
    letter-spacing: 0.04em;
    text-transform: none;
}

.sidebar-label span {
    background: var(--surface-hi);
    border-radius: var(--radius-pill);
    padding: 1px 8px;
    font-size: 0.62rem;
    color: var(--text-md);
}

[data-theme="light"] .sidebar-label span {
    background: #f0ebe0;
    border: 1px solid #ccc;
    border-radius: var(--radius-pill);
}

#user-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 2px;
    overflow-y: auto;
    flex: 1;
    padding: 4px 8px 8px;
}

.user-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 7px 8px;
    border-radius: var(--radius);
    transition: background 0.15s;
}

.user-item:hover {
    background: var(--surface-md);
}

[data-theme="light"] .user-item:hover {
    background: #f5f0e8;
}

.user-avatar {
    width: 26px;
    height: 26px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--plasma-lo), var(--plasma));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.72rem;
    font-weight: 600;
    color: #fff;
    flex-shrink: 0;
}

[data-theme="light"] .user-avatar {
    background: var(--plasma);
    border: 1.5px solid #2d2d2d;
    border-radius: 50%;
    box-shadow: 1px 1px 0px 0px #2d2d2d;
}

.user-name {
    font-size: 0.8rem;
    font-family: var(--font-body);
    color: var(--text-md);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    flex: 1;
}

.user-crown {
    font-size: 0.72rem;
}

.user-you {
    color: var(--text-lo);
    font-size: 0.7rem;
}

.sidebar-actions {
    padding: 12px 16px;
    border-top: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    gap: 8px;
}

[data-theme="light"] .sidebar-actions {
    border-top: 2px solid var(--border);
}

/* ── Messages area ─────────────────────────────────────────── */

#messages {
    grid-area: messages;
    overflow-y: auto;
    padding: 20px 24px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    scroll-behavior: smooth;
}

#messages::-webkit-scrollbar {
    width: 4px;
}
#messages::-webkit-scrollbar-track {
    background: transparent;
}
#messages::-webkit-scrollbar-thumb {
    background: var(--surface-hi);
    border-radius: 2px;
}

[data-theme="light"] #messages::-webkit-scrollbar-thumb {
    background: #d8d0c8;
    border-radius: 2px;
}

.msg {
    display: flex;
    animation: msgIn 0.25s ease forwards;
    opacity: 0;
    transform: translateY(8px);
}

@keyframes msgIn {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.msg--self {
    justify-content: flex-end;
}
.msg--other {
    justify-content: flex-start;
}

.msg__bubble {
    max-width: 65%;
    padding: 10px 14px;
    border-radius: 16px;
    display: flex;
    flex-direction: column;
    gap: 5px;
    position: relative;
}

.msg--self .msg__bubble {
    background: linear-gradient(
        135deg,
        rgba(61, 71, 153, 0.6),
        rgba(94, 106, 210, 0.45)
    );
    border: 1px solid rgba(94, 106, 210, 0.35);
    border-bottom-right-radius: 4px;
    box-shadow: 0 2px 16px rgba(94, 106, 210, 0.2);
}

.msg--other .msg__bubble {
    background: var(--surface-md);
    border: 1px solid var(--border);
    border-bottom-left-radius: 4px;
}

[data-theme="light"] .msg--self .msg__bubble {
    background: #fff9f9;
    border: 2px solid var(--plasma);
    border-bottom-right-radius: 4px;
    box-shadow: 3px 3px 0px 0px rgba(255, 77, 77, 0.3);
}

[data-theme="light"] .msg--other .msg__bubble {
    background: #ffffff;
    border: 2px solid #2d2d2d;
    border-bottom-left-radius: 4px;
    box-shadow: 3px 3px 0px 0px rgba(45, 45, 45, 0.15);
}

.msg__sender {
    font-size: 0.68rem;
    font-family: var(--font-body);
    color: var(--pulse);
    font-weight: 500;
    letter-spacing: 0.05em;
}

[data-theme="light"] .msg__sender {
    color: var(--pulse);
    font-weight: 600;
}

.msg__text {
    font-size: 0.88rem;
    font-family: var(--font-body);
    color: var(--text-hi);
    line-height: 1.55;
    word-break: break-word;
}

[data-theme="light"] .msg__text {
    font-size: 0.95rem;
    line-height: 1.5;
}

.msg__time {
    font-size: 0.62rem;
    font-family: var(--font-body);
    color: var(--text-lo);
    align-self: flex-end;
    margin-top: 2px;
}

.msg__image {
    max-width: 260px;
    border-radius: 10px;
    cursor: pointer;
    transition: opacity 0.2s;
}
.msg__image:hover {
    opacity: 0.88;
}

[data-theme="light"] .msg__image {
    border-radius: 4px;
    border: 2px solid #2d2d2d;
}

.msg__audio,
.msg__video {
    max-width: 280px;
    width: 100%;
    border-radius: 8px;
}

.msg__file {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--pulse);
    font-family: var(--font-body);
    font-size: 0.83rem;
    text-decoration: none;
    padding: 6px 10px;
    background: var(--surface-md);
    border-radius: 8px;
    border: 1px solid rgba(94, 106, 210, 0.2);
    transition: background 0.15s;
}
.msg__file:hover {
    background: var(--surface-hi);
}

[data-theme="light"] .msg__file {
    background: #f5f0e8;
    border: 2px solid var(--pulse);
    border-radius: var(--radius);
    box-shadow: 2px 2px 0px 0px var(--pulse);
    color: var(--pulse);
}

[data-theme="light"] .msg__file:hover {
    transform: translate(1px, 1px);
    box-shadow: 1px 1px 0px 0px var(--pulse);
}

/* System message */
.msg--system {
    justify-content: center;
}
.msg--system .msg__bubble {
    max-width: 100%;
    background: transparent;
    border: none;
    padding: 0;
}
.msg--system .msg__text {
    font-size: 0.72rem;
    color: var(--text-lo);
    letter-spacing: 0.06em;
    text-align: center;
}

[data-theme="light"] .msg--system .msg__text {
    font-style: italic;
}

/* ── Input bar ─────────────────────────────────────────────── */

.chat-input-area {
    grid-area: input;
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 0 16px;
    background: var(--surface);
    padding-bottom: env(safe-area-inset-bottom, 0px);
    border-top: 1px solid var(--border);
    backdrop-filter: var(--blur-sm);
    -webkit-backdrop-filter: var(--blur-sm);
}

[data-theme="light"] .chat-input-area {
    background: rgba(255, 255, 255, 0.97);
    border-top: 2px solid var(--border);
    backdrop-filter: none;
}

#msg-input {
    flex: 1;
    background: var(--surface-md);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 10px 14px;
    color: var(--text-hi);
    font-family: var(--font-body);
    font-size: 0.88rem;
    outline: none;
    resize: none;
    height: 42px;
    max-height: 120px;
    line-height: 1.4;
    overflow-y: auto;
    transition:
        border-color 0.2s,
        box-shadow 0.2s;
}

#msg-input:focus {
    border-color: var(--plasma);
    box-shadow: 0 0 0 2px rgba(94, 106, 210, 0.12);
}

[data-theme="light"] #msg-input {
    background: #fdfbf7;
    border: 2px solid #2d2d2d;
    border-radius: var(--radius-form);
    box-shadow: 2px 2px 0px 0px #2d2d2d;
}

[data-theme="light"] #msg-input:focus {
    border-color: var(--pulse);
    box-shadow: 3px 3px 0px 0px var(--pulse);
}

#msg-input::placeholder {
    color: var(--text-lo);
}

/* ── Drag-drop overlay ─────────────────────────────────────── */

#drop-overlay {
    position: fixed;
    inset: 0;
    z-index: 50;
    background: rgba(2, 2, 3, 0.88);
    display: flex;
    align-items: center;
    justify-content: center;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.2s;
}

[data-theme="light"] #drop-overlay {
    background: rgba(253, 251, 247, 0.92);
}

#drop-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

.drop-hint {
    font-family: var(--font-display);
    font-size: 1.1rem;
    color: var(--plasma);
    letter-spacing: 0.12em;
    padding: 40px 60px;
    border: 2px dashed var(--border-hi);
    border-radius: var(--radius-lg);
    background: var(--surface);
    backdrop-filter: var(--blur);
    -webkit-backdrop-filter: var(--blur);
    text-align: center;
}

[data-theme="light"] .drop-hint {
    background: #ffffff;
    border: 3px dashed var(--plasma);
    box-shadow: 6px 6px 0px 0px #2d2d2d;
    letter-spacing: 0.04em;
    backdrop-filter: none;
}

/* ── Toast ─────────────────────────────────────────────────── */

#toast-container {
    position: fixed;
    bottom: 80px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 100;
    display: flex;
    flex-direction: column;
    gap: 8px;
    align-items: center;
}

.toast {
    padding: 9px 18px;
    border-radius: var(--radius-pill);
    font-size: 0.78rem;
    font-family: var(--font-body);
    letter-spacing: 0.05em;
    backdrop-filter: var(--blur);
    -webkit-backdrop-filter: var(--blur);
    border: 1px solid var(--border);
    background: var(--surface-md);
    color: var(--text-hi);
    opacity: 0;
    transform: translateY(6px);
    transition:
        opacity 0.25s,
        transform 0.25s;
    pointer-events: none;
}

.toast--visible {
    opacity: 1;
    transform: translateY(0);
}
.toast--success {
    border-color: rgba(94, 106, 210, 0.4);
    color: var(--pulse);
}
.toast--warn {
    border-color: rgba(255, 200, 0, 0.4);
    color: #f4d03f;
}
.toast--error {
    border-color: rgba(248, 113, 113, 0.4);
    color: var(--danger);
}

[data-theme="light"] .toast {
    background: #ffffff;
    border: 2px solid #2d2d2d;
    border-radius: var(--radius-pill);
    box-shadow: 3px 3px 0px 0px #2d2d2d;
    backdrop-filter: none;
}

[data-theme="light"] .toast--success {
    color: var(--pulse);
    border-color: var(--pulse);
    box-shadow: 3px 3px 0px 0px var(--pulse);
}
[data-theme="light"] .toast--error {
    color: var(--danger);
    border-color: var(--danger);
    box-shadow: 3px 3px 0px 0px var(--danger);
}

/* ── Modal ─────────────────────────────────────────────────── */

.modal-overlay {
    position: fixed;
    inset: 0;
    z-index: 200;
    background: var(--modal-bg);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s;
    backdrop-filter: blur(4px);
}

[data-theme="light"] .modal-overlay {
    backdrop-filter: none;
}

.modal-overlay--visible {
    opacity: 1;
    pointer-events: auto;
}

.modal-card {
    background: var(--surface);
    backdrop-filter: var(--blur);
    -webkit-backdrop-filter: var(--blur);
    border: 1px solid var(--border-hi);
    border-radius: var(--radius-lg);
    padding: 28px;
    max-width: 380px;
    width: 100%;
    box-shadow: var(--shadow-card);
    transform: scale(0.95);
    transition: transform 0.2s;
}

[data-theme="light"] .modal-card {
    background: #ffffff;
    border: 2px solid #2d2d2d;
    border-radius: var(--radius-lg);
    box-shadow: 8px 8px 0px 0px #2d2d2d;
    backdrop-filter: none;
}

.modal-overlay--visible .modal-card {
    transform: scale(1);
}

.modal-title {
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-hi);
    margin-bottom: 10px;
}

.modal-body {
    font-size: 0.83rem;
    font-family: var(--font-body);
    color: var(--text-md);
    margin-bottom: 22px;
    line-height: 1.55;
}

.modal-actions {
    display: flex;
    gap: 10px;
    justify-content: flex-end;
}

.share-body {
    display: grid;
    gap: 16px;
}

.share-block {
    display: grid;
    gap: 12px;
}

.share-label {
    font-size: 0.78rem;
    font-family: var(--font-body);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--text-md);
}

.share-link-box {
    display: flex;
    gap: 10px;
    align-items: center;
}

.share-link {
    flex: 1;
    width: 100%;
    background: var(--surface-md);
    border: 1px solid var(--border);
    border-radius: var(--radius-form);
    padding: 10px 12px;
    color: var(--text-hi);
    font-family: var(--font-body);
    font-size: 0.9rem;
}

.share-link:focus {
    outline: none;
    border-color: var(--plasma);
}

.share-qr-block .qr-card {
    min-height: 164px;
    display: grid;
    place-items: center;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--surface-hi);
    cursor: pointer;
    overflow: hidden;
    position: relative;
    transition:
        border-color 0.2s ease,
        background 0.2s ease;
}

.share-qr-block .qr-card:hover {
    border-color: var(--plasma);
}

.qr-ghost {
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 16px;
    color: var(--text-md);
    width: 100%;
    height: 100%;
    transition: opacity 0.2s ease;
}

[data-theme="light"] .qr-ghost {
    background: rgba(245, 240, 232, 0.95);
    color: var(--text-lo);
}

.qr-ghost__text {
    font-size: 0.95rem;
    line-height: 1.4;
}

.qr-image {
    width: 100%;
    height: auto;
    display: block;
    border-radius: var(--radius);
}

/* ── Loading overlay ───────────────────────────────────────── */

#loading-overlay {
    position: fixed;
    inset: 0;
    z-index: 300;
    background: var(--loading-bg);
    display: none;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    gap: 14px;
    backdrop-filter: blur(6px);
}

[data-theme="light"] #loading-overlay {
    backdrop-filter: none;
}

.loading-spinner {
    width: 36px;
    height: 36px;
    border: 2px solid var(--surface-hi);
    border-top-color: var(--plasma);
    border-radius: 50%;
    animation: spin 0.7s linear infinite;
}

[data-theme="light"] .loading-spinner {
    border: 3px solid #e5e0d8;
    border-top-color: var(--plasma);
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

.loading-text {
    font-family: var(--font-display);
    font-size: 0.72rem;
    color: var(--text-md);
    letter-spacing: 0.1em;
}

[data-theme="light"] .loading-text {
    font-size: 0.85rem;
    letter-spacing: 0.04em;
}

/* ── Invite panel ──────────────────────────────────────────── */

.invite-panel {
    margin: 8px 16px;
    padding: 12px;
    background: var(--surface-md);
    border: 1px solid var(--border);
    border-radius: var(--radius);
}

[data-theme="light"] .invite-panel {
    background: #f5f0e8;
    border: 2px solid #2d2d2d;
    border-radius: var(--radius);
    box-shadow: 3px 3px 0px 0px #2d2d2d;
}

.invite-link {
    font-size: 0.68rem;
    font-family: var(--font-body);
    color: var(--text-lo);
    word-break: break-all;
    margin: 8px 0;
    line-height: 1.4;
}

#qr-canvas {
    display: block;
    margin: 8px auto 0;
    border-radius: 8px;
    background: #fff;
    padding: 6px;
}

[data-theme="light"] #qr-canvas {
    border: 2px solid #2d2d2d;
    border-radius: 4px;
    box-shadow: 2px 2px 0px 0px #2d2d2d;
}

/* ── Scrollbar ─────────────────────────────────────────────── */

::-webkit-scrollbar {
    width: 4px;
}
::-webkit-scrollbar-track {
    background: transparent;
}
::-webkit-scrollbar-thumb {
    background: var(--surface-hi);
    border-radius: 2px;
}

[data-theme="light"] ::-webkit-scrollbar-thumb {
    background: #d8d0c8;
}

/* ── Responsive ────────────────────────────────────────────── */

@media (max-width: 680px) {
    .chat-layout {
        grid-template-columns: 1fr;
        grid-template-rows: 56px 1fr 68px;
        grid-template-areas:
            "header"
            "messages"
            "input";
    }

    .chat-sidebar {
        width: min(92vw, 320px);
    }

    #theme-toggle span:not(.theme-toggle__icon) {
        display: none;
    }

    #theme-toggle {
        padding: 8px 10px;
    }
}

/* ══════════════════════════════════════════════════════════════
   CHAT PAGE — extra elements (invite overlay, admin badge, etc.)
   ══════════════════════════════════════════════════════════════ */

/* ── Invite toggle link ─────────────────────────────────────── */

.invite-toggle {
    font-size: 0.72rem;
    cursor: pointer;
    color: var(--pulse);
    background: none;
    border: none;
    font-family: var(--font-body);
    letter-spacing: 0.06em;
    padding: 0;
    transition: opacity 0.15s;
}
.invite-toggle:hover {
    text-decoration: underline;
    opacity: 0.8;
}

[data-theme="light"] .invite-toggle {
    font-size: 0.8rem;
    letter-spacing: 0.02em;
    color: var(--pulse);
}

#invite-section {
    display: none;
}
#invite-section.visible {
    display: block;
}

/* ── Admin badge ────────────────────────────────────────────── */

.admin-section {
    margin: 4px 0;
}

.admin-badge {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    font-size: 0.65rem;
    font-family: var(--font-body);
    color: var(--plasma);
    letter-spacing: 0.08em;
    background: rgba(94, 106, 210, 0.12);
    border: 1px solid rgba(94, 106, 210, 0.28);
    border-radius: var(--radius-pill);
    padding: 2px 8px;
}

[data-theme="light"] .admin-badge {
    background: rgba(255, 77, 77, 0.08);
    border: 1.5px solid var(--plasma);
    border-radius: var(--radius-pill);
    box-shadow: 2px 2px 0px 0px rgba(255, 77, 77, 0.25);
    letter-spacing: 0.03em;
}

/* ── Input hint ─────────────────────────────────────────────── */

.input-hint {
    font-size: 0.62rem;
    font-family: var(--font-body);
    color: var(--text-lo);
    text-align: center;
    padding: 2px 0 0;
}

/* ── Invite-link join overlay (arrive via share link) ───────── */

#invite-join-wrap {
    position: fixed;
    inset: 0;
    z-index: 90;
    background: var(--modal-bg);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    display: none;
    align-items: center;
    justify-content: center;
    padding: 24px;
}

[data-theme="light"] #invite-join-wrap {
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
}

#invite-join-wrap.active {
    display: flex;
}

.invite-join-card {
    max-width: 360px;
    width: 100%;
}

/* On light theme give it a slight tilt like the landing card */
[data-theme="light"] .invite-join-card {
    transform: rotate(-0.5deg);
}