/* ── CSS Variables ─────────────────────────────────────────────────────────── */

:root {
    --color-primary: #6C63FF;
    --color-primary-dim: #5a52e0;
    --color-accent: #FF6584;
    --color-success: #2ECC71;
    --color-warning: #F39C12;
    --color-danger: #E74C3C;
    --bg: #F0F2FF;
    --bg-card: #FFFFFF;
    --bg-input: #F5F6FF;
    --bg-overlay: rgba(15, 10, 40, 0.55);
    --text-primary: #1A1633;
    --text-secondary: #64607A;
    --text-muted: #9C98B0;
    --border: rgba(108, 99, 255, 0.15);
    --shadow: 0 4px 24px rgba(108, 99, 255, 0.12);
    --shadow-hover: 0 8px 32px rgba(108, 99, 255, 0.22);
    --radius: 14px;
    --radius-sm: 8px;
    --radius-lg: 20px;
    --header-h: 64px;
    --self-bar-h: 48px;
    --transition: 0.2s ease;
}

@media(prefers-color-scheme:dark) {
    :root {
        --bg: #0D0B1E;
        --bg-card: #1A1630;
        --bg-input: #231F3A;
        --bg-overlay: rgba(5, 3, 15, 0.75);
        --text-primary: #EEEAF8;
        --text-secondary: #A9A4C4;
        --text-muted: #6A6585;
        --border: rgba(108, 99, 255, 0.25);
        --shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
        --shadow-hover: 0 8px 32px rgba(108, 99, 255, 0.3);
    }

}

/* ── Reset & Base ──────────────────────────────────────────────────────────── */

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg);
    color: var(--text-primary);
    min-height: 100dvh;
    padding-bottom: calc(var(--self-bar-h) + 16px);
    -webkit-font-smoothing: antialiased;
}

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

.header {
    position: sticky;
    top: 0;
    z-index: 100;
    height: var(--header-h);
    background: var(--bg-card);
    border-bottom: 1px solid var(--border);
    box-shadow: 0 2px 12px rgba(108, 99, 255, 0.08);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.header-inner {
    max-width: 960px;
    margin: 0 auto;
    height: 100%;
    padding: 0 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-icon {
    font-size: 1.6rem;
}

.logo-text {
    font-size: 1.25rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.3px;
}

/* ── Status badge ──────────────────────────────────────────────────────────── */

.status-badge {
    display: flex;
    align-items: center;
    gap: 7px;
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-secondary);
    padding: 5px 12px;
    border-radius: 99px;
    background: var(--bg-input);
    border: 1px solid var(--border);
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--text-muted);
    transition: background var(--transition);
    flex-shrink: 0;
}

.status-badge.connected.status-dot {
    background: var(--color-success);
    box-shadow: 0 0 6px var(--color-success);
}

.status-badge.connecting.status-dot {
    background: var(--color-warning);
    animation: pulse-dot 1s infinite;
}

.status-badge.disconnected.status-dot {
    background: var(--color-danger);
}

@keyframes pulse-dot {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0.3;
    }

}

/* ── Main ──────────────────────────────────────────────────────────────────── */

.main {
    max-width: 960px;
    margin: 0 auto;
    padding: 32px 20px;
    display: flex;
    flex-direction: column;
    gap: 36px;
}

/* ── Section headings ──────────────────────────────────────────────────────── */

.section-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-bottom: 6px;
}

.section-subtitle {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 20px;
}

/* ── Device grid ───────────────────────────────────────────────────────────── */

.device-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 16px;
}

/* ── Device card ───────────────────────────────────────────────────────────── */

.device-card {
    background: var(--bg-card);
    border: 1.5px solid var(--border);
    border-radius: var(--radius);
    padding: 24px 16px 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
    user-select: none;
    position: relative;
    overflow: hidden;
}

.device-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    opacity: 0;
    transition: opacity var(--transition);
}

.device-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-hover);
    border-color: var(--color-primary);
}

.device-card:hover::before {
    opacity: 0.04;
}

.device-card:active {
    transform: translateY(0);
}

.device-icon {
    font-size: 2.6rem;
    line-height: 1;
    position: relative;
    z-index: 1;
}

.device-name {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-primary);
    text-align: center;
    line-height: 1.3;
    position: relative;
    z-index: 1;
}

.device-browser {
    font-size: 0.75rem;
    color: var(--text-muted);
    position: relative;
    z-index: 1;
}

.device-online-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--color-success);
    box-shadow: 0 0 6px var(--color-success);
    position: absolute;
    top: 14px;
    right: 14px;
}

.device-card.entering {
    animation: card-in 0.3s ease;
}

@keyframes card-in {
    from {
        opacity: 0;
        transform: scale(0.85);
    }

    to {
        opacity: 1;
        transform: scale(1);
    }

}

.device-card.leaving {
    animation: card-out 0.25s ease forwards;
}

@keyframes card-out {
    to {
        opacity: 0;
        transform: scale(0.85);
    }

}

/* ── Empty state ───────────────────────────────────────────────────────────── */

.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    padding: 60px 20px;
    text-align: center;
    position: relative;
}

.empty-state.hidden {
    display: none;
}

.pulse-ring {
    position: absolute;
    top: 50px;
    width: 120px;
    height: 120px;
    border-radius: 50%;
    border: 2px solid var(--color-primary);
    opacity: 0;
    animation: radar 2.5s ease-out infinite;
}

.pulse-ring::after {
    content: '';
    position: absolute;
    inset: 20px;
    border-radius: 50%;
    border: 2px solid var(--color-accent);
    opacity: 0;
    animation: radar 2.5s ease-out 0.8s infinite;
}

@keyframes radar {
    0% {
        transform: scale(0.4);
        opacity: 0.8;
    }

    100% {
        transform: scale(2.2);
        opacity: 0;
    }

}

.empty-icon {
    font-size: 3rem;
    position: relative;
    z-index: 1;
}

.empty-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-secondary);
    position: relative;
    z-index: 1;
}

.empty-desc {
    font-size: 0.85rem;
    color: var(--text-muted);
    max-width: 340px;
    line-height: 1.5;
    position: relative;
    z-index: 1;
}

/* ── Transfer cards ────────────────────────────────────────────────────────── */

.transfer-card {
    background: var(--bg-card);
    border: 1.5px solid var(--border);
    border-radius: var(--radius);
    padding: 18px 20px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    animation: card-in 0.3s ease;
}

.transfer-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}

.transfer-file-info {
    display: flex;
    align-items: center;
    gap: 10px;
    min-width: 0;
}

.transfer-file-icon {
    font-size: 1.5rem;
    flex-shrink: 0;
}

.transfer-file-name {
    font-size: 0.9rem;
    font-weight: 600;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    color: var(--text-primary);
}

.transfer-meta {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.transfer-cancel-btn {
    background: none;
    border: 1px solid var(--border);
    color: var(--text-muted);
    padding: 4px 10px;
    border-radius: 99px;
    cursor: pointer;
    font-size: 0.75rem;
    flex-shrink: 0;
    transition: all var(--transition);
}

.transfer-cancel-btn:hover {
    border-color: var(--color-danger);
    color: var(--color-danger);
}

/* Progress bar */

.progress-bar-track {
    height: 6px;
    border-radius: 99px;
    background: var(--bg-input);
    overflow: hidden;
}

.progress-bar-fill {
    height: 100%;
    border-radius: 99px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
    transition: width 0.15s ease;
    min-width: 4px;
}

.transfer-stats {
    display: flex;
    justify-content: space-between;
    font-size: 0.75rem;
    color: var(--text-muted);
}

.transfer-status-text {
    font-size: 0.8rem;
    font-weight: 500;
}

.transfer-status-text.success {
    color: var(--color-success);
}

.transfer-status-text.error {
    color: var(--color-danger);
}

/* ── History ───────────────────────────────────────────────────────────────── */

.history-toggle {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    background: var(--bg-card);
    border: 1.5px solid var(--border);
    border-radius: var(--radius);
    padding: 14px 18px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-secondary);
    transition: all var(--transition);
}

.history-toggle:hover {
    border-color: var(--color-primary);
    color: var(--text-primary);
}

.history-arrow {
    transition: transform var(--transition);
    display: inline-block;
}

.history-toggle[aria-expanded="true"] .history-arrow {
    transform: rotate(180deg);
}

.history-list {
    margin-top: 8px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.history-item {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 12px 16px;
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 0.85rem;
}

.history-icon {
    font-size: 1.2rem;
}

.history-info {
    flex: 1;
    min-width: 0;
}

.history-name {
    font-weight: 500;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.history-detail {
    color: var(--text-muted);
    font-size: 0.75rem;
}

.history-direction {
    font-size: 0.7rem;
    font-weight: 600;
    padding: 3px 8px;
    border-radius: 99px;
}

.history-direction.sent {
    background: rgba(108, 99, 255, 0.1);
    color: var(--color-primary);
}

.history-direction.received {
    background: rgba(46, 204, 113, 0.1);
    color: var(--color-success);
}

/* ── Self bar ──────────────────────────────────────────────────────────────── */

.self-bar {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: var(--self-bar-h);
    background: var(--bg-card);
    border-top: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-size: 0.85rem;
    padding: 0 20px;
    z-index: 50;
}

.self-label {
    color: var(--text-muted);
}

.self-name {
    font-weight: 600;
    color: var(--color-primary);
}

.self-id {
    color: var(--text-muted);
    font-size: 0.75rem;
    font-family: monospace;
}

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

.modal-overlay {
    position: fixed;
    inset: 0;
    z-index: 200;
    background: var(--bg-overlay);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    animation: fade-in 0.15s ease;
}

.modal-overlay[hidden] {
    display: none;
}

@keyframes fade-in {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

.modal {
    background: var(--bg-card);
    border: 1.5px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 36px 32px 28px;
    width: 100%;
    max-width: 440px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
    box-shadow: 0 24px 64px rgba(0, 0, 0, 0.3);
    animation: modal-in 0.2s ease;
}

.modal-sm {
    max-width: 340px;
}

@keyframes modal-in {
    from {
        opacity: 0;
        transform: scale(0.92) translateY(16px);
    }

    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }

}

.modal-icon {
    font-size: 3rem;
}

.modal-title {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-primary);
    text-align: center;
}

.modal-body {
    font-size: 0.9rem;
    color: var(--text-secondary);
    text-align: center;
    line-height: 1.5;
}

.modal-file-info {
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 12px 16px;
    width: 100%;
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.modal-actions {
    display: flex;
    gap: 10px;
    width: 100%;
    margin-top: 4px;
}

.modal-actions.btn {
    flex: 1;
}

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

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 11px 20px;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    border: 1.5px solid transparent;
    transition: all var(--transition);
    white-space: nowrap;
}

.btn:disabled {
    opacity: 0.45;
    cursor: not-allowed;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dim));
    color: #fff;
    border-color: var(--color-primary);
}

.btn-primary:hover:not(:disabled) {
    filter: brightness(1.1);
    transform: translateY(-1px);
}

.btn-danger {
    background: var(--bg-input);
    color: var(--color-danger);
    border-color: var(--color-danger);
}

.btn-danger:hover:not(:disabled) {
    background: var(--color-danger);
    color: #fff;
}

.btn-ghost {
    background: var(--bg-input);
    color: var(--text-secondary);
    border-color: var(--border);
}

.btn-ghost:hover:not(:disabled) {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

/* ── Drop zone ─────────────────────────────────────────────────────────────── */

.drop-zone {
    width: 100%;
    border: 2px dashed var(--border);
    border-radius: var(--radius);
    padding: 28px 16px;
    text-align: center;
    cursor: pointer;
    transition: all var(--transition);
    background: var(--bg-input);
}

.drop-zone:hover,

.drop-zone.drag-over {
    border-color: var(--color-primary);
    background: rgba(108, 99, 255, 0.06);
}

.drop-zone-inner {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    pointer-events: none;
}

.drop-icon {
    font-size: 2rem;
}

.drop-zone p {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.drop-zone p strong {
    color: var(--color-primary);
}

.drop-hint {
    font-size: 0.75rem !important;
    color: var(--text-muted) !important;
}

/* ── Text share ────────────────────────────────────────────────────────────── */

.text-share {
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.text-share-label {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-weight: 500;
    text-align: center;
}

.text-input {
    width: 100%;
    background: var(--bg-input);
    border: 1.5px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 10px 12px;
    color: var(--text-primary);
    font-size: 0.85rem;
    font-family: inherit;
    resize: vertical;
    transition: border-color var(--transition);
}

.text-input:focus {
    outline: none;
    border-color: var(--color-primary);
}

/* ── Selected files list ───────────────────────────────────────────────────── */

.selected-files {
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 6px;
    max-height: 160px;
    overflow-y: auto;
}

.selected-file-item {
    display: flex;
    align-items: center;
    gap: 8px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 8px 12px;
    font-size: 0.82rem;
}

.selected-file-item span {
    flex: 1;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    color: var(--text-secondary);
}

.selected-file-remove {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text-muted);
    font-size: 1rem;
    line-height: 1;
    padding: 0 2px;
    transition: color var(--transition);
}

.selected-file-remove:hover {
    color: var(--color-danger);
}

/* ── Verify code ───────────────────────────────────────────────────────────── */

.verify-code-block {
    width: 100%;
    text-align: center;
}

.verify-label {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 8px;
}

.verify-code {
    font-family: 'SF Mono', 'Fira Code', 'Fira Mono', 'Roboto Mono', monospace;
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: 0.25em;
    color: var(--color-primary);
    background: var(--bg-input);
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 12px 20px;
    display: inline-block;
}

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

.toast-container {
    position: fixed;
    bottom: calc(var(--self-bar-h) + 16px);
    right: 16px;
    z-index: 300;
    display: flex;
    flex-direction: column;
    gap: 8px;
    pointer-events: none;
}

.toast {
    background: var(--bg-card);
    border: 1.5px solid var(--border);
    border-radius: var(--radius);
    padding: 12px 18px;
    font-size: 0.85rem;
    color: var(--text-primary);
    box-shadow: var(--shadow);
    animation: toast-in 0.25s ease;
    display: flex;
    align-items: center;
    gap: 10px;
    max-width: 320px;
    pointer-events: all;
}

.toast.success {
    border-color: var(--color-success);
}

.toast.error {
    border-color: var(--color-danger);
}

.toast.info {
    border-color: var(--color-primary);
}

.toast-icon {
    font-size: 1.1rem;
    flex-shrink: 0;
}

@keyframes toast-in {
    from {
        opacity: 0;
        transform: translateX(20px);
    }

    to {
        opacity: 1;
        transform: translateX(0);
    }

}

@keyframes toast-out {
    to {
        opacity: 0;
        transform: translateX(20px);
    }

}

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

::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-primary);
}

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

@media(max-width:600px) {
    .main {
        padding: 20px 14px;
        gap: 24px;
    }

    .device-grid {
        grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
        gap: 12px;
    }

    .device-card {
        padding: 18px 12px 14px;
    }

    .modal {
        padding: 28px 20px 22px;
    }

    .logo-text {
        font-size: 1.1rem;
    }

    .verify-code {
        font-size: 1.5rem;
    }

}