/* ====================================================
   WorkFlow – Design System (Light / Dark)
   ==================================================== */

:root,
[data-theme="light"] {
    color-scheme: light;

    --primary: #4f46e5;
    --primary-dark: #3730a3;
    --primary-light: #818cf8;
    --primary-glow: rgba(79, 70, 229, 0.35);
    --secondary: #06b6d4;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;

    --bg: #f4f6fb;
    --bg-accent: radial-gradient(ellipse 80% 60% at 50% -10%, rgba(79, 70, 229, 0.08), transparent 70%);
    --surface: #ffffff;
    --surface-muted: #f8fafc;
    --surface-hover: #f1f5f9;
    --surface-glass: rgba(255, 255, 255, 0.82);

    --sidebar-bg: #ffffff;
    --sidebar-border: #e8edf5;
    --sidebar-text: #64748b;
    --sidebar-text-active: #1e293b;
    --sidebar-hover: rgba(79, 70, 229, 0.06);
    --sidebar-active: linear-gradient(135deg, #4f46e5 0%, #6366f1 100%);
    --sidebar-brand: #0f172a;

    --card-bg: #ffffff;
    --text: #0f172a;
    --text-muted: #64748b;
    --text-soft: #94a3b8;
    --border: #e2e8f0;
    --border-strong: #cbd5e1;
    --input-bg: #ffffff;

    --shadow: 0 1px 2px rgba(15, 23, 42, 0.04), 0 1px 3px rgba(15, 23, 42, 0.06);
    --shadow-md: 0 4px 12px rgba(15, 23, 42, 0.06), 0 2px 4px rgba(15, 23, 42, 0.04);
    --shadow-lg: 0 12px 32px rgba(15, 23, 42, 0.1), 0 4px 8px rgba(15, 23, 42, 0.04);
    --shadow-glow: 0 8px 24px var(--primary-glow);

    --toast-bg: #1e293b;
    --toast-text: #f8fafc;
    --modal-overlay: rgba(15, 23, 42, 0.45);
    --chat-header-bg: #fafbfc;
    --bubble-other: #ffffff;
    --bubble-me: var(--primary);
    --skeleton-base: #e2e8f0;
    --skeleton-shine: #f8fafc;

    --radius: 12px;
    --radius-sm: 8px;
    --radius-lg: 16px;
    --sidebar-w: 252px;
    --transition: 0.28s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-spring: 0.45s cubic-bezier(0.34, 1.2, 0.64, 1);
    --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
    color-scheme: dark;

    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #a5b4fc;
    --primary-glow: rgba(99, 102, 241, 0.4);
    --secondary: #22d3ee;
    --success: #34d399;
    --warning: #fbbf24;
    --danger: #f87171;

    --bg: #09090f;
    --bg-accent: radial-gradient(ellipse 70% 50% at 50% -5%, rgba(99, 102, 241, 0.15), transparent 65%);
    --surface: #12121c;
    --surface-muted: #16162a;
    --surface-hover: #1c1c32;
    --surface-glass: rgba(18, 18, 28, 0.85);

    --sidebar-bg: #0c0c14;
    --sidebar-border: rgba(255, 255, 255, 0.06);
    --sidebar-text: #94a3b8;
    --sidebar-text-active: #f1f5f9;
    --sidebar-hover: rgba(255, 255, 255, 0.05);
    --sidebar-active: linear-gradient(135deg, #4f46e5 0%, #7c3aed 100%);
    --sidebar-brand: #ffffff;

    --card-bg: #12121c;
    --text: #f1f5f9;
    --text-muted: #94a3b8;
    --text-soft: #64748b;
    --border: rgba(255, 255, 255, 0.08);
    --border-strong: rgba(255, 255, 255, 0.14);
    --input-bg: #16162a;

    --shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.35);
    --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.45);
    --shadow-glow: 0 8px 28px var(--primary-glow);

    --toast-bg: #1e1e35;
    --toast-text: #f1f5f9;
    --modal-overlay: rgba(0, 0, 0, 0.65);
    --chat-header-bg: #16162a;
    --bubble-other: #1c1c32;
    --bubble-me: var(--primary);
    --skeleton-base: #1c1c32;
    --skeleton-shine: #2a2a45;
}

/* ── Theme toggle button ── */
.theme-toggle {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-sm);
    border: 1.5px solid var(--border);
    background: var(--surface);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--text-muted);
    transition: background var(--transition-fast), color var(--transition-fast),
                border-color var(--transition-fast), transform var(--transition-spring);
    position: relative;
    overflow: hidden;
}

.theme-toggle:hover {
    background: var(--surface-hover);
    color: var(--primary);
    border-color: var(--primary-light);
    transform: rotate(-8deg) scale(1.05);
}

.theme-toggle:active {
    transform: scale(0.95);
}

.theme-toggle .icon-sun,
.theme-toggle .icon-moon {
    position: absolute;
    transition: opacity var(--transition-fast), transform var(--transition-spring);
}

[data-theme="light"] .theme-toggle .icon-sun { opacity: 1; transform: rotate(0deg) scale(1); }
[data-theme="light"] .theme-toggle .icon-moon { opacity: 0; transform: rotate(90deg) scale(0.5); }
[data-theme="dark"] .theme-toggle .icon-sun { opacity: 0; transform: rotate(-90deg) scale(0.5); }
[data-theme="dark"] .theme-toggle .icon-moon { opacity: 1; transform: rotate(0deg) scale(1); }

/* ── Nav sliding indicator ── */
.sidebar-nav {
    position: relative;
}

.nav-indicator {
    position: absolute;
    left: 0.75rem;
    right: 0.75rem;
    height: 0;
    background: var(--sidebar-active);
    border-radius: var(--radius-sm);
    pointer-events: none;
    z-index: 0;
    opacity: 0;
    transition: transform var(--transition-spring), height var(--transition-spring), opacity var(--transition-fast);
    box-shadow: var(--shadow-glow);
}

.nav-indicator.visible {
    opacity: 1;
}

.nav-item {
    position: relative;
    z-index: 1;
}

[data-theme="light"] .nav-item.active {
    background: transparent !important;
    color: #fff !important;
    box-shadow: none !important;
}

[data-theme="dark"] .nav-item.active {
    background: transparent !important;
    color: #fff !important;
    box-shadow: none !important;
}

/* ── Page transitions ── */
.page-section {
    display: none;
    opacity: 0;
}

.page-section.active {
    display: block;
    animation: sectionEnter 0.42s cubic-bezier(0.22, 1, 0.36, 1) both;
}

.page-section.leaving {
    display: block;
    animation: sectionLeave 0.22s cubic-bezier(0.4, 0, 1, 1) both;
    pointer-events: none;
}

@keyframes sectionEnter {
    from { opacity: 0; transform: translateY(14px) scale(0.985); filter: blur(4px); }
    to   { opacity: 1; transform: none; filter: none; }
}

@keyframes sectionLeave {
    from { opacity: 1; transform: none; filter: none; }
    to   { opacity: 0; transform: translateY(-8px) scale(0.99); filter: blur(2px); }
}

.page-section.active > .card,
.page-section.active > div > .card,
.page-section.active .stats-grid .stat-card {
    animation: cardStagger 0.5s cubic-bezier(0.22, 1, 0.36, 1) both;
}

.page-section.active .stats-grid .stat-card:nth-child(1) { animation-delay: 0.04s; }
.page-section.active .stats-grid .stat-card:nth-child(2) { animation-delay: 0.08s; }
.page-section.active .stats-grid .stat-card:nth-child(3) { animation-delay: 0.12s; }
.page-section.active .stats-grid .stat-card:nth-child(4) { animation-delay: 0.16s; }

@keyframes cardStagger {
    from { opacity: 0; transform: translateY(16px); }
    to   { opacity: 1; transform: none; }
}

/* ── Enhanced components (theme-aware) ── */
body {
    background: var(--bg);
    background-image: var(--bg-accent);
    background-attachment: fixed;
    transition: background-color 0.35s ease, color 0.35s ease;
}

.sidebar {
    background: var(--sidebar-bg);
    border-right: 1px solid var(--sidebar-border);
    box-shadow: var(--shadow-md);
}

.sidebar-header {
    border-bottom: 1px solid var(--sidebar-border);
}

.sidebar-logo {
    background: var(--sidebar-active);
    box-shadow: var(--shadow-glow);
}

.sidebar-brand { color: var(--sidebar-brand); }

.nav-section-label { color: var(--text-soft); }

.nav-item {
    color: var(--sidebar-text);
}

.nav-item:hover {
    background: var(--sidebar-hover);
    color: var(--sidebar-text-active);
}

.sidebar-footer { border-top: 1px solid var(--sidebar-border); }
.user-name { color: var(--sidebar-text-active); }
.user-role { color: var(--text-soft); }

.topbar {
    background: var(--surface-glass);
    backdrop-filter: blur(16px) saturate(1.4);
    -webkit-backdrop-filter: blur(16px) saturate(1.4);
    border-bottom: 1px solid var(--border);
}

.icon-btn {
    background: var(--surface);
    border-color: var(--border);
    color: var(--text-muted);
}

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

.notif-dot { border-color: var(--surface); }

.card {
    background: var(--card-bg);
    border-color: var(--border);
    transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.card:hover {
    border-color: var(--border-strong);
}

.stat-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.activite-item,
.notif-item,
.friend-card,
.post-card,
.feed-compose,
.search-results,
.modal,
.chat-layout {
    background: var(--surface);
    border-color: var(--border);
}

.activite-item:hover,
.friend-card:hover,
.post-card:hover {
    border-color: var(--primary-light);
    box-shadow: var(--shadow-md);
}

.form-control,
.compose-textarea,
.chat-input {
    background: var(--input-bg);
    border-color: var(--border);
    color: var(--text);
}

.form-control:focus,
.compose-textarea:focus,
.chat-input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.15);
}

.post-content { color: var(--text); }

.chat-header { background: var(--chat-header-bg); }
.chat-messages { background: var(--bg); }
.chat-bubble { background: var(--bubble-other); }
.chat-input-bar { background: var(--surface); }

.chat-bubble-wrap.me .chat-bubble {
    background: var(--bubble-me);
    border-color: var(--bubble-me);
}

.modal-overlay { background: var(--modal-overlay); }
.modal { background: var(--surface); }

.toast {
    background: var(--toast-bg);
    color: var(--toast-text);
    backdrop-filter: blur(12px);
}

.skeleton {
    background: linear-gradient(90deg, var(--skeleton-base) 25%, var(--skeleton-shine) 50%, var(--skeleton-base) 75%);
    background-size: 200% 100%;
}

.tab-btn.active { background: var(--surface); }

.alert-error {
    background: rgba(239, 68, 68, 0.1);
    color: var(--danger);
    border-color: rgba(239, 68, 68, 0.25);
}

.alert-success {
    background: rgba(16, 185, 129, 0.1);
    color: var(--success);
    border-color: rgba(16, 185, 129, 0.25);
}

[data-theme="dark"] .badge-high { background: rgba(239,68,68,0.15); color: #fca5a5; }
[data-theme="dark"] .badge-medium { background: rgba(245,158,11,0.15); color: #fcd34d; }
[data-theme="dark"] .badge-low { background: rgba(16,185,129,0.15); color: #6ee7b7; }

/* Auth pages */
.auth-wrapper {
    background: var(--bg);
    background-image:
        radial-gradient(ellipse 60% 50% at 20% 20%, rgba(79, 70, 229, 0.18), transparent),
        radial-gradient(ellipse 50% 40% at 80% 80%, rgba(6, 182, 212, 0.12), transparent),
        linear-gradient(160deg, #0f0f1a 0%, #1a1a35 50%, #12121c 100%);
    transition: background 0.4s ease;
}

[data-theme="light"] .auth-wrapper {
    background-image:
        radial-gradient(ellipse 60% 50% at 20% 20%, rgba(79, 70, 229, 0.12), transparent),
        radial-gradient(ellipse 50% 40% at 80% 80%, rgba(6, 182, 212, 0.08), transparent),
        linear-gradient(160deg, #eef2ff 0%, #f8fafc 50%, #f1f5f9 100%);
}

.auth-card {
    background: var(--surface);
    border: 1px solid var(--border);
    box-shadow: var(--shadow-lg);
}

/* Profile & collection (from dashboard inline) */
.profile-avatar {
    background: var(--sidebar-active);
    box-shadow: var(--shadow-glow);
}

.collection-item {
    border-color: var(--border);
    background: var(--surface-muted);
}

.post-activite-card {
    background: rgba(79, 70, 229, 0.06);
    border-color: rgba(79, 70, 229, 0.15);
}

[data-theme="dark"] .post-activite-card {
    background: rgba(99, 102, 241, 0.1);
    border-color: rgba(99, 102, 241, 0.2);
}

/* Ripple effect on nav */
.nav-item::after {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: inherit;
    background: radial-gradient(circle, rgba(255,255,255,0.25) 0%, transparent 70%);
    opacity: 0;
    transform: scale(0);
    transition: opacity 0.4s, transform 0.4s;
    pointer-events: none;
}

.nav-item.ripple::after {
    opacity: 1;
    transform: scale(1);
    transition: opacity 0.5s, transform 0.5s;
}

/* Floating animation for stat icons */
.stat-icon {
    transition: transform var(--transition-spring);
}

.stat-card:hover .stat-icon {
    transform: scale(1.1) rotate(-3deg);
}

/* Smooth scroll */
html {
    scroll-behavior: smooth;
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    html { scroll-behavior: auto; }
}

/* ── Theme switch transition ── */
html.theme-switching,
html.theme-switching * {
    transition: background-color 0.35s ease, color 0.25s ease, border-color 0.3s ease, box-shadow 0.3s ease !important;
}

.theme-toggle.theme-toggle-spin {
    animation: themeSpin 0.5s cubic-bezier(0.34, 1.4, 0.64, 1);
}

@keyframes themeSpin {
    0%   { transform: rotate(0deg) scale(1); }
    40%  { transform: rotate(180deg) scale(1.12); }
    100% { transform: rotate(360deg) scale(1); }
}

[data-theme="dark"] .theme-toggle {
    background: linear-gradient(135deg, rgba(99,102,241,0.15), rgba(124,58,237,0.1));
    border-color: rgba(99,102,241,0.35);
}

[data-theme="light"] .theme-toggle {
    background: linear-gradient(135deg, rgba(251,191,36,0.12), rgba(245,158,11,0.08));
    border-color: rgba(245,158,11,0.3);
}

/* ── Animated background orbs ── */
.auth-wrapper::before,
.auth-wrapper::after,
.page-body::before {
    content: '';
    position: fixed;
    border-radius: 50%;
    pointer-events: none;
    z-index: 0;
    filter: blur(60px);
    animation: orbFloat 18s ease-in-out infinite alternate;
}

.auth-wrapper::before {
    width: 45vw; height: 45vw;
    top: -15%; left: -10%;
    background: radial-gradient(circle, rgba(79,70,229,0.22), transparent 70%);
}

.auth-wrapper::after {
    width: 40vw; height: 40vw;
    bottom: -10%; right: -8%;
    background: radial-gradient(circle, rgba(6,182,212,0.16), transparent 70%);
    animation-delay: -6s;
}

[data-theme="light"] .auth-wrapper::before {
    background: radial-gradient(circle, rgba(79,70,229,0.14), transparent 70%);
}
[data-theme="light"] .auth-wrapper::after {
    background: radial-gradient(circle, rgba(6,182,212,0.1), transparent 70%);
}

.page-body {
    position: relative;
}

.page-body::before {
    width: 35vw; height: 35vw;
    top: 5%; right: -5%;
    background: radial-gradient(circle, rgba(99,102,241,0.08), transparent 70%);
    opacity: 0.7;
}

@keyframes orbFloat {
    0%   { transform: translate(0, 0) scale(1); }
    50%  { transform: translate(3%, 2%) scale(1.05); }
    100% { transform: translate(-2%, 4%) scale(0.95); }
}

.auth-card {
    position: relative;
    z-index: 1;
    animation: authCardEnter 0.55s cubic-bezier(0.22, 1, 0.36, 1) both;
}

@keyframes authCardEnter {
    from { opacity: 0; transform: translateY(20px) scale(0.97); }
    to   { opacity: 1; transform: none; }
}

/* ── Gradient accent cards ── */
.stat-card {
    position: relative;
    overflow: hidden;
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary), var(--secondary), #7c3aed);
    opacity: 0;
    transition: opacity var(--transition);
}

.stat-card:hover::before { opacity: 1; }

.stat-card:nth-child(1)::before { background: linear-gradient(90deg, #4f46e5, #6366f1); }
.stat-card:nth-child(2)::before { background: linear-gradient(90deg, #06b6d4, #22d3ee); }
.stat-card:nth-child(3)::before { background: linear-gradient(90deg, #10b981, #34d399); }
.stat-card:nth-child(4)::before { background: linear-gradient(90deg, #f59e0b, #fbbf24); }

.card {
    position: relative;
}

.card::after {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: inherit;
    background: linear-gradient(135deg, rgba(79,70,229,0.04), rgba(6,182,212,0.03));
    opacity: 0;
    transition: opacity var(--transition);
    pointer-events: none;
}

.card:hover::after { opacity: 1; }

[data-theme="dark"] .card::after {
    background: linear-gradient(135deg, rgba(99,102,241,0.06), rgba(34,211,238,0.04));
}

/* ── Auth page extras ── */
.auth-icon-circle {
    width: 72px; height: 72px;
    border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    margin: 0 auto 1.5rem;
    background: linear-gradient(135deg, rgba(79,70,229,0.15), rgba(124,58,237,0.1));
    border: 1.5px solid rgba(79,70,229,0.25);
    animation: iconPulse 3s ease-in-out infinite;
}

.auth-icon-circle.success {
    background: linear-gradient(135deg, rgba(16,185,129,0.15), rgba(5,150,105,0.1));
    border-color: rgba(16,185,129,0.3);
}

@keyframes iconPulse {
    0%, 100% { box-shadow: 0 0 0 0 rgba(79,70,229,0.2); }
    50%      { box-shadow: 0 0 0 12px rgba(79,70,229,0); }
}

.hint-box {
    background: rgba(79,70,229,0.06);
    border: 1px solid rgba(79,70,229,0.18);
    border-radius: var(--radius-sm);
    padding: 0.75rem 1rem;
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 1.25rem;
    line-height: 1.5;
}

.hint-box strong { color: var(--primary-light); }

.otp-inputs {
    display: flex;
    gap: 0.6rem;
    justify-content: center;
    margin-bottom: 1.25rem;
}

.otp-digit {
    width: 48px; height: 56px;
    background: var(--input-bg);
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text);
    font-size: 1.4rem;
    font-weight: 700;
    text-align: center;
    outline: none;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast), transform var(--transition-spring);
}

.otp-digit:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-glow);
    transform: scale(1.05);
}

.strength-bar {
    margin-top: 0.5rem;
    height: 4px;
    border-radius: 2px;
    background: var(--border);
    overflow: hidden;
}

.strength-fill {
    height: 100%;
    border-radius: 2px;
    width: 0;
    transition: width 0.3s, background 0.3s;
}

.strength-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 0.3rem;
}

/* ── Feed & social hover lift ── */
.post-card,
.friend-card,
.activite-item {
    transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.post-card:hover,
.friend-card:hover {
    transform: translateY(-2px);
}

/* ── Topbar title fade ── */
.topbar-title.changing {
    opacity: 0;
    transform: translateY(-4px);
}

/* ── Logo shimmer ── */
.sidebar-logo,
.auth-logo .logo-icon {
    position: relative;
    overflow: hidden;
}

.sidebar-logo::after,
.auth-logo .logo-icon::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(105deg, transparent 40%, rgba(255,255,255,0.25) 50%, transparent 60%);
    transform: translateX(-120%);
    animation: logoShine 4s ease-in-out infinite;
}

@keyframes logoShine {
    0%, 70%, 100% { transform: translateX(-120%); }
    85% { transform: translateX(120%); }
}