/* ════════════════════════════════════════════════
   LectureDigest — Study Rooms Styles
   ════════════════════════════════════════════════ */

.sr-page {
    min-height: 100vh;
    padding: 24px 16px 80px;
    position: relative;
    z-index: 1;
}

.sr-inner {
    max-width: 900px;
    margin: 0 auto;
}

/* ── Header ── */
.sr-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 20px;
    gap: 16px;
}

.sr-header-center {
    text-align: center;
    flex: 1;
}

.sr-page-title {
    font-size: 24px;
    font-weight: 800;
    color: var(--text-primary, #f1f5f9);
    margin: 0;
}

.sr-page-sub {
    font-size: 13px;
    color: var(--text-secondary, #94a3b8);
    margin: 4px 0 0;
}

.sr-header-actions {
    min-width: 100px;
    text-align: right;
}

.sr-create-btn, .sr-invite-btn {
    background: rgba(139, 92, 246, 0.15);
    border: 1px solid rgba(139, 92, 246, 0.3);
    color: #a78bfa;
    padding: 8px 14px;
    border-radius: 10px;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

.sr-create-btn:hover, .sr-invite-btn:hover {
    background: rgba(139, 92, 246, 0.25);
    border-color: rgba(139, 92, 246, 0.5);
}

/* ── Join Bar ── */
.sr-join-bar {
    display: flex;
    gap: 8px;
    margin-bottom: 20px;
}

.sr-join-input {
    flex: 1;
    background: rgba(15, 15, 30, 0.5);
    border: 1px solid rgba(139, 92, 246, 0.2);
    border-radius: 10px;
    padding: 10px 14px;
    color: var(--text-primary, #f1f5f9);
    font-size: 14px;
    outline: none;
}

.sr-join-input:focus {
    border-color: rgba(139, 92, 246, 0.5);
}

.sr-join-btn {
    background: linear-gradient(135deg, #8b5cf6, #6d28d9);
    border: none;
    border-radius: 10px;
    color: #fff;
    padding: 10px 18px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s;
}

.sr-join-btn:hover {
    transform: translateY(-1px);
}

/* ── Room List ── */
.sr-room-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.sr-room-card {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 16px 18px;
    background: rgba(30, 30, 58, 0.5);
    border: 1px solid rgba(255, 255, 255, 0.06);
    border-radius: 14px;
    cursor: pointer;
    transition: all 0.2s;
}

.sr-room-card:hover {
    border-color: rgba(139, 92, 246, 0.3);
    background: rgba(139, 92, 246, 0.06);
}

.sr-room-icon {
    font-size: 28px;
}

.sr-room-info {
    flex: 1;
}

.sr-room-name {
    font-size: 15px;
    font-weight: 700;
    color: var(--text-primary, #f1f5f9);
}

.sr-room-meta {
    display: flex;
    gap: 12px;
    font-size: 12px;
    color: var(--text-secondary, #94a3b8);
    margin-top: 4px;
}

.sr-room-role {
    font-size: 18px;
}

/* ── Tabs ── */
.sr-tabs {
    display: flex;
    gap: 4px;
    margin-bottom: 16px;
    background: rgba(15, 15, 30, 0.4);
    border-radius: 12px;
    padding: 4px;
}

.sr-tab {
    flex: 1;
    padding: 10px 12px;
    background: transparent;
    border: none;
    border-radius: 10px;
    color: var(--text-secondary, #94a3b8);
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

.sr-tab:hover {
    color: var(--text-primary, #f1f5f9);
}

.sr-tab.sr-tab-active {
    background: rgba(139, 92, 246, 0.2);
    color: #a78bfa;
}

.sr-tab-content {
    min-height: 300px;
}

/* ── Discussion / Chat ── */
.sr-chat-messages {
    max-height: 500px;
    overflow-y: auto;
    padding: 12px;
    background: rgba(15, 15, 30, 0.3);
    border: 1px solid rgba(255, 255, 255, 0.04);
    border-radius: 14px;
    margin-bottom: 12px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.sr-msg {
    display: flex;
    gap: 10px;
    align-items: flex-start;
}

.sr-msg-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    font-weight: 700;
    color: #fff;
    flex-shrink: 0;
}

.sr-msg-avatar-img {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    object-fit: cover;
    flex-shrink: 0;
}

.sr-msg-body {
    flex: 1;
    min-width: 0;
}

.sr-msg-header {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 2px;
}

.sr-msg-name {
    font-size: 13px;
    font-weight: 700;
    color: var(--text-primary, #f1f5f9);
}

.sr-msg-time {
    font-size: 11px;
    color: var(--text-secondary, #64748b);
}

.sr-msg-del {
    margin-left: auto;
    background: none;
    border: none;
    color: var(--text-secondary, #64748b);
    font-size: 12px;
    cursor: pointer;
    opacity: 0;
    transition: opacity 0.2s, color 0.2s;
    padding: 2px 6px;
    border-radius: 4px;
}

.sr-msg:hover .sr-msg-del {
    opacity: 1;
}

.sr-msg-del:hover {
    color: #f87171;
    background: rgba(248, 113, 113, 0.1);
}

.sr-msg-text {
    font-size: 14px;
    color: var(--text-secondary, #cbd5e1);
    line-height: 1.5;
    word-break: break-word;
}

.sr-msg-tag {
    font-size: 11px;
    color: #a78bfa;
    margin-top: 4px;
}

.sr-no-comments {
    text-align: center;
    padding: 40px 20px;
    color: var(--text-secondary, #94a3b8);
    font-size: 14px;
}

.sr-chat-input-wrap {
    display: flex;
    gap: 8px;
}

.sr-chat-input {
    flex: 1;
    background: rgba(15, 15, 30, 0.5);
    border: 1px solid rgba(139, 92, 246, 0.2);
    border-radius: 12px;
    padding: 12px 16px;
    color: var(--text-primary, #f1f5f9);
    font-size: 14px;
    outline: none;
}

.sr-chat-input:focus {
    border-color: rgba(139, 92, 246, 0.5);
}

.sr-send-btn {
    background: linear-gradient(135deg, #8b5cf6, #6d28d9);
    border: none;
    border-radius: 12px;
    padding: 12px 14px;
    cursor: pointer;
    color: #fff;
    transition: transform 0.2s;
}

.sr-send-btn:hover {
    transform: scale(1.05);
}

/* ── Videos ── */
.sr-add-video-bar {
    margin-bottom: 12px;
}

.sr-add-video-btn {
    background: rgba(139, 92, 246, 0.1);
    border: 1px dashed rgba(139, 92, 246, 0.3);
    border-radius: 10px;
    padding: 10px 16px;
    color: #a78bfa;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    width: 100%;
    transition: all 0.2s;
}

.sr-add-video-btn:hover {
    background: rgba(139, 92, 246, 0.15);
    border-color: rgba(139, 92, 246, 0.5);
}

.sr-video-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.sr-video-card {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px;
    background: rgba(30, 30, 58, 0.4);
    border: 1px solid rgba(255, 255, 255, 0.06);
    border-radius: 12px;
}

.sr-video-thumb {
    width: 80px;
    height: 45px;
    border-radius: 8px;
    object-fit: cover;
}

.sr-video-thumb-placeholder {
    width: 80px;
    height: 45px;
    border-radius: 8px;
    background: rgba(139, 92, 246, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
}

.sr-video-info {
    flex: 1;
}

.sr-video-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary, #f1f5f9);
}

.sr-video-meta {
    font-size: 12px;
    color: var(--text-secondary, #94a3b8);
    margin-top: 2px;
}

.sr-video-actions {
    flex-shrink: 0;
}

.sr-video-view-btn, .sr-video-analyze-btn {
    padding: 6px 12px;
    border-radius: 8px;
    font-size: 12px;
    font-weight: 600;
    cursor: pointer;
    border: none;
    transition: all 0.2s;
}

.sr-video-view-btn {
    background: rgba(139, 92, 246, 0.15);
    color: #a78bfa;
}

.sr-video-view-btn:hover {
    background: rgba(139, 92, 246, 0.25);
}

.sr-video-analyze-btn {
    background: rgba(59, 130, 246, 0.15);
    color: #93c5fd;
}

.sr-video-analyze-btn:hover {
    background: rgba(59, 130, 246, 0.25);
}

/* ── Progress ── */
.sr-progress-grid {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.sr-progress-card {
    background: rgba(30, 30, 58, 0.4);
    border: 1px solid rgba(255, 255, 255, 0.06);
    border-radius: 14px;
    padding: 16px;
}

.sr-progress-video-title {
    font-size: 14px;
    font-weight: 700;
    color: var(--text-primary, #f1f5f9);
    margin-bottom: 12px;
}

.sr-progress-table {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.sr-progress-row {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 8px;
    padding: 8px 10px;
    border-radius: 8px;
    font-size: 13px;
    color: var(--text-secondary, #cbd5e1);
}

.sr-progress-row.sr-progress-header {
    font-weight: 700;
    color: var(--text-secondary, #94a3b8);
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.sr-progress-row:not(.sr-progress-header) {
    background: rgba(15, 15, 30, 0.3);
}

.sr-progress-name {
    font-weight: 600;
    color: var(--text-primary, #f1f5f9);
}

.sr-progress-val {
    text-align: center;
}

/* ── Members ── */
.sr-member-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.sr-member-card {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    background: rgba(30, 30, 58, 0.4);
    border: 1px solid rgba(255, 255, 255, 0.06);
    border-radius: 12px;
}

.sr-member-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    font-weight: 700;
    color: #fff;
}

.sr-member-avatar-img {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    object-fit: cover;
}

.sr-member-info {
    flex: 1;
}

.sr-member-name {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary, #f1f5f9);
}

.sr-member-meta {
    font-size: 12px;
    color: var(--text-secondary, #94a3b8);
    margin-top: 2px;
}

.sr-member-actions {
    display: flex;
    gap: 6px;
    flex-shrink: 0;
}

.sr-member-action-btn {
    width: 32px;
    height: 32px;
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 8px;
    background: rgba(15, 15, 30, 0.4);
    font-size: 14px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
}

.sr-member-action-btn:hover {
    border-color: rgba(139, 92, 246, 0.3);
    background: rgba(139, 92, 246, 0.1);
}

.sr-kick-btn:hover {
    border-color: rgba(248, 113, 113, 0.4);
    background: rgba(248, 113, 113, 0.1);
}

.sr-video-del-btn {
    width: 32px;
    height: 32px;
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 8px;
    background: rgba(15, 15, 30, 0.4);
    font-size: 14px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
    margin-left: 6px;
}

.sr-video-del-btn:hover {
    border-color: rgba(248, 113, 113, 0.4);
    background: rgba(248, 113, 113, 0.1);
}

/* ── Modals ── */
.sr-modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9000;
    padding: 20px;
}

.sr-modal {
    background: #1e1e3a;
    border: 1px solid rgba(139, 92, 246, 0.2);
    border-radius: 18px;
    padding: 28px;
    max-width: 420px;
    width: 100%;
}

.sr-modal-title {
    font-size: 18px;
    font-weight: 800;
    color: var(--text-primary, #f1f5f9);
    margin: 0 0 20px;
}

.sr-modal-desc {
    font-size: 14px;
    color: var(--text-secondary, #94a3b8);
    margin: 0 0 16px;
}

.sr-modal-field {
    margin-bottom: 16px;
}

.sr-modal-field label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-secondary, #94a3b8);
    margin-bottom: 6px;
}

.sr-modal-field input[type="text"] {
    width: 100%;
    background: rgba(15, 15, 30, 0.5);
    border: 1px solid rgba(139, 92, 246, 0.2);
    border-radius: 10px;
    padding: 10px 14px;
    color: var(--text-primary, #f1f5f9);
    font-size: 14px;
    outline: none;
    box-sizing: border-box;
}

.sr-modal-field input:focus {
    border-color: rgba(139, 92, 246, 0.5);
}

.sr-icon-picker {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
}

.sr-icon-opt {
    width: 36px;
    height: 36px;
    border: 2px solid transparent;
    border-radius: 10px;
    background: rgba(15, 15, 30, 0.5);
    font-size: 18px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
}

.sr-icon-opt:hover {
    border-color: rgba(139, 92, 246, 0.3);
}

.sr-icon-opt.sr-icon-selected {
    border-color: #8b5cf6;
    background: rgba(139, 92, 246, 0.15);
}

.sr-modal-actions {
    display: flex;
    gap: 10px;
    justify-content: flex-end;
    margin-top: 20px;
}

.sr-modal-cancel {
    background: transparent;
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    padding: 10px 18px;
    color: var(--text-secondary, #94a3b8);
    font-size: 14px;
    cursor: pointer;
}

.sr-modal-confirm {
    background: linear-gradient(135deg, #8b5cf6, #6d28d9);
    border: none;
    border-radius: 10px;
    padding: 10px 20px;
    color: #fff;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
}

.sr-modal-confirm:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* ── Invite Code ── */
.sr-invite-code-wrap {
    display: flex;
    align-items: center;
    gap: 10px;
    background: rgba(15, 15, 30, 0.5);
    border: 1px solid rgba(139, 92, 246, 0.2);
    border-radius: 12px;
    padding: 14px 16px;
}

.sr-invite-code {
    flex: 1;
    font-size: 20px;
    font-weight: 800;
    color: #a78bfa;
    letter-spacing: 2px;
    font-family: 'JetBrains Mono', monospace;
}

.sr-copy-btn {
    background: rgba(139, 92, 246, 0.15);
    border: 1px solid rgba(139, 92, 246, 0.3);
    border-radius: 8px;
    padding: 8px 12px;
    color: #a78bfa;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
}

.sr-copy-btn:hover {
    background: rgba(139, 92, 246, 0.25);
}

/* ── Video Picker ── */
.sr-picker-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.sr-picker-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 12px;
    background: rgba(15, 15, 30, 0.4);
    border: 1px solid rgba(255, 255, 255, 0.06);
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.2s;
}

.sr-picker-item:hover {
    background: rgba(139, 92, 246, 0.1);
    border-color: rgba(139, 92, 246, 0.3);
}

.sr-picker-thumb {
    width: 72px;
    height: 40px;
    border-radius: 6px;
    object-fit: cover;
    flex-shrink: 0;
}

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

.sr-picker-title {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-primary, #f1f5f9);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.sr-picker-meta {
    font-size: 11px;
    color: var(--text-secondary, #94a3b8);
    margin-top: 2px;
}

/* ── Empty / Loading ── */
.sr-empty {
    text-align: center;
    padding: 60px 20px;
}

.sr-empty-icon {
    font-size: 48px;
    margin-bottom: 16px;
}

.sr-empty h3 {
    font-size: 18px;
    font-weight: 700;
    color: var(--text-primary, #f1f5f9);
    margin: 0 0 8px;
}

.sr-empty p {
    font-size: 14px;
    color: var(--text-secondary, #94a3b8);
    margin: 0;
}

.sr-loading, .sr-error {
    text-align: center;
    padding: 40px;
    color: var(--text-secondary, #94a3b8);
    font-size: 14px;
}

/* ── Responsive ── */
@media (max-width: 640px) {
    .sr-header {
        flex-wrap: wrap;
    }

    .sr-tabs {
        overflow-x: auto;
    }

    .sr-tab {
        font-size: 12px;
        padding: 8px 8px;
    }

    .sr-progress-row {
        grid-template-columns: 1.5fr 1fr 1fr 1fr;
        font-size: 12px;
    }

    .sr-chat-messages {
        max-height: 350px;
    }
}

/* ── Light mode ── */
.light-mode .sr-room-card,
.light-mode .sr-member-card,
.light-mode .sr-video-card,
.light-mode .sr-progress-card {
    background: rgba(255, 255, 255, 0.8);
    border-color: rgba(0, 0, 0, 0.08);
}

.light-mode .sr-chat-messages {
    background: rgba(248, 250, 252, 0.8);
    border-color: rgba(0, 0, 0, 0.06);
}

.light-mode .sr-modal {
    background: #fff;
    border-color: rgba(0, 0, 0, 0.1);
}

.light-mode .sr-tabs {
    background: rgba(248, 250, 252, 0.8);
}


.light-mode .sr-join-input {
    background: #fff;
    border-color: rgba(139, 92, 246, 0.2);
    color: #1e293b;
}
.light-mode .sr-join-input::placeholder { color: #94a3b8; }


/* Comment send status */
.sr-msg-sending { opacity: 0.7; }
.sr-msg-sending .sr-msg-time { color: #a78bfa; animation: srPulse 1s infinite; }
.sr-msg-failed .sr-msg-time { color: #f87171; }
@keyframes srPulse { 0%,100% { opacity: 1; } 50% { opacity: 0.4; } }


/* Comments loading */
.sr-comments-loading { display: flex; flex-direction: column; align-items: center; justify-content: center; padding: 40px; gap: 12px; }
.sr-comments-loading p { font-size: 13px; color: var(--text-secondary, #94a3b8); margin: 0; }
.sr-loading-dots { display: flex; gap: 6px; }
.sr-loading-dots span { width: 8px; height: 8px; border-radius: 50%; background: #8b5cf6; animation: srDotBounce 1.2s infinite; }
.sr-loading-dots span:nth-child(2) { animation-delay: 0.2s; }
.sr-loading-dots span:nth-child(3) { animation-delay: 0.4s; }
@keyframes srDotBounce { 0%,80%,100% { transform: scale(0.6); opacity: 0.4; } 40% { transform: scale(1); opacity: 1; } }