/* =========================================================
   ADULLAM LEARNING — FOUNDATION UI
   Premium responsive design system with micro-animations
   ========================================================= */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800;900&display=swap');

:root {
    --font-sans: 'Inter', ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    --ink-950: #050d1a;
    --ink-900: #0a1525;
    --ink-800: #132238;
    --ink-700: #1f3350;
    --ink-600: #3d5575;
    --ink-500: #5e7494;
    --ink-400: #8599b5;
    --ink-300: #b3c2d6;
    --ink-200: #d6deec;
    --ink-100: #e8eef6;
    --ink-50: #f3f6fb;

    --primary-800: #3730a3;
    --primary-700: #4338ca;
    --primary-600: #4f46e5;
    --primary-500: #6366f1;
    --primary-400: #818cf8;
    --primary-300: #a5b4fc;
    --primary-100: #e0e7ff;
    --primary-50: #eef2ff;

    --cyan-700: #0e7490;
    --cyan-600: #0891b2;
    --cyan-500: #06b6d4;
    --cyan-400: #22d3ee;
    --cyan-100: #cffafe;
    --emerald-600: #059669;
    --emerald-500: #10b981;
    --emerald-100: #d1fae5;
    --amber-600: #d97706;
    --amber-500: #f59e0b;
    --amber-100: #fef3c7;
    --rose-600: #e11d48;
    --rose-500: #f43f5e;
    --rose-100: #ffe4e6;
    --violet-600: #7c3aed;
    --violet-500: #8b5cf6;
    --violet-100: #ede9fe;

    --surface: #ffffff;
    --surface-soft: rgba(255, 255, 255, .72);
    --surface-muted: #f5f8fd;
    --page: #f0f4fa;
    --border: rgba(30, 48, 76, .09);
    --border-strong: rgba(30, 48, 76, .15);
    --border-glow: rgba(99, 102, 241, .18);

    --shadow-xs: 0 1px 3px rgba(10, 22, 41, .06);
    --shadow-sm: 0 4px 16px rgba(19, 33, 56, .06), 0 1px 3px rgba(19, 33, 56, .04);
    --shadow-md: 0 12px 40px rgba(19, 33, 56, .09), 0 2px 6px rgba(19, 33, 56, .04);
    --shadow-lg: 0 24px 70px rgba(14, 27, 48, .14), 0 4px 12px rgba(14, 27, 48, .05);
    --shadow-xl: 0 32px 90px rgba(10, 20, 40, .18);
    --shadow-glow: 0 8px 32px rgba(79, 70, 229, .22), 0 0 0 1px rgba(99, 102, 241, .08);
    --shadow-glow-lg: 0 14px 48px rgba(79, 70, 229, .28);
    --shadow-cyan-glow: 0 8px 32px rgba(6, 182, 212, .20);

    --radius-xs: 8px;
    --radius-sm: 12px;
    --radius-md: 16px;
    --radius-lg: 22px;
    --radius-xl: 28px;
    --radius-2xl: 32px;

    --ease: cubic-bezier(.2, .8, .2, 1);
    --spring: cubic-bezier(.34, 1.56, .64, 1);
    --fast: 160ms;
    --normal: 280ms;

    --safe-top: env(safe-area-inset-top, 0px);
    --safe-right: env(safe-area-inset-right, 0px);
    --safe-bottom: env(safe-area-inset-bottom, 0px);
    --safe-left: env(safe-area-inset-left, 0px);

    /* Mobile app guards */
    --app-top-bar: 0px;
    --app-bottom-bar: 0px;
}

* { box-sizing: border-box; }
html { min-width: 320px; background: var(--page); scroll-behavior: smooth; }
body {
    margin: 0;
    min-width: 320px;
    min-height: 100vh;
    min-height: 100dvh;
    color: var(--ink-900);
    background: var(--page);
    font-family: var(--font-sans);
    font-size: 15px;
    line-height: 1.55;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
    overflow-x: hidden;
    font-feature-settings: 'cv02', 'cv03', 'cv04', 'cv11';
}

/* Premium gradient mesh background */
body::before {
    content: "";
    position: fixed;
    inset: 0;
    z-index: -2;
    pointer-events: none;
    background:
        radial-gradient(ellipse 80% 50% at 80% -15%, rgba(99, 102, 241, .12), transparent),
        radial-gradient(ellipse 60% 40% at -5% 40%, rgba(6, 182, 212, .08), transparent),
        radial-gradient(ellipse 50% 50% at 50% 110%, rgba(124, 58, 237, .06), transparent),
        linear-gradient(180deg, #f2f5fc 0%, #edf2fa 40%, #f0f4fa 100%);
}

/* Subtle dot-grid pattern */
body::after {
    content: "";
    position: fixed;
    inset: 0;
    z-index: -1;
    pointer-events: none;
    opacity: .35;
    background-image:
        radial-gradient(circle, rgba(50, 70, 100, .045) 1px, transparent 1px);
    background-size: 24px 24px;
    mask-image: linear-gradient(to bottom, black 10%, transparent 78%);
}

img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button, input, select, textarea { font: inherit; }
button, a, input, select, textarea { -webkit-tap-highlight-color: transparent; }
button { cursor: pointer; }
button:disabled { cursor: not-allowed; opacity: .55; filter: grayscale(.3); }
svg { width: 1em; height: 1em; stroke-width: 1.8; }
[hidden] { display: none !important; }

::selection { background: rgba(99, 102, 241, .18); color: var(--ink-950); }

:focus-visible {
    outline: 2.5px solid rgba(99, 102, 241, .30);
    outline-offset: 2px;
    border-radius: 2px;
}

h1, h2, h3, p { margin-top: 0; }
h1, h2, h3 { color: var(--ink-950); letter-spacing: -.032em; line-height: 1.14; }
h1 { margin-bottom: 8px; font-size: clamp(1.6rem, 2.3vw, 2.3rem); font-weight: 800; }
h2 { margin-bottom: 5px; font-size: clamp(1.08rem, 1.5vw, 1.3rem); font-weight: 780; }
h3 { margin-bottom: 5px; font-size: 1rem; font-weight: 750; }

.eyebrow {
    margin: 0 0 6px;
    color: var(--primary-600);
    font-size: .66rem;
    font-weight: 800;
    letter-spacing: .14em;
    text-transform: uppercase;
    background: linear-gradient(135deg, var(--primary-600), var(--cyan-600));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.muted, .student-muted { color: var(--ink-500); }
.visually-hidden {
    position: absolute !important;
    width: 1px !important;
    height: 1px !important;
    padding: 0 !important;
    margin: -1px !important;
    overflow: hidden !important;
    clip: rect(0, 0, 0, 0) !important;
    white-space: nowrap !important;
    border: 0 !important;
}

/* ─── Forms ──────────────────────────────────────────── */
.form-field { display: grid; gap: 7px; min-width: 0; }
.form-field > label,
.form-field > span:first-child {
    color: var(--ink-700);
    font-size: .76rem;
    font-weight: 720;
    letter-spacing: .01em;
}

input:not([type="checkbox"]):not([type="radio"]),
select,
textarea {
    width: 100%;
    min-width: 0;
    border: 1.5px solid var(--border-strong);
    border-radius: 13px;
    background: rgba(255, 255, 255, .95);
    color: var(--ink-900);
    padding: 12px 14px;
    outline: none;
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, .8), var(--shadow-xs);
    transition: border-color var(--fast) var(--ease), box-shadow var(--fast) var(--ease), background var(--fast), transform var(--fast);
}

textarea { resize: vertical; min-height: 96px; }
select { min-height: 46px; }
input:not([type="checkbox"]):not([type="radio"]):hover,
select:hover,
textarea:hover { border-color: rgba(99, 102, 241, .32); }
input:not([type="checkbox"]):not([type="radio"]):focus,
select:focus,
textarea:focus {
    border-color: rgba(99, 102, 241, .55);
    background: #fff;
    box-shadow: 0 0 0 4px rgba(99, 102, 241, .10), 0 0 0 1px rgba(99, 102, 241, .15), var(--shadow-xs);
    transform: translateY(-1px);
}
input::placeholder, textarea::placeholder { color: #97a6b8; }

input[type="checkbox"], input[type="radio"] {
    width: 18px;
    height: 18px;
    accent-color: var(--primary-600);
    border-radius: 5px;
}

.stacked-form { display: grid; gap: 15px; }
.form-helper { margin: -2px 0 0; color: var(--ink-500); font-size: .72rem; }
.choice-row { display: flex; align-items: center; gap: 9px; color: var(--ink-700); font-size: .8rem; font-weight: 650; }

/* ─── Buttons ────────────────────────────────────────── */
.primary-button,
.secondary-button,
.danger-button,
.text-button,
.inline-text-button,
.student-secondary-button,
.student-secondary-link,
.student-hero-action,
.student-course-link,
.student-material-link,
.video-control-button,
.video-control-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    min-height: 44px;
    border-radius: 13px;
    border: 1.5px solid transparent;
    padding: 10px 16px;
    font-weight: 720;
    line-height: 1;
    letter-spacing: -.005em;
    transition: transform var(--fast) var(--spring), box-shadow var(--normal), background var(--fast), border-color var(--fast), color var(--fast), filter var(--fast);
}

.primary-button {
    color: #fff;
    border-color: rgba(67, 56, 202, .6);
    background: linear-gradient(135deg, #5b52f0 0%, #4f46e5 40%, #4338ca 100%);
    box-shadow: 0 6px 20px rgba(79, 70, 229, .22), 0 2px 4px rgba(79, 70, 229, .12), inset 0 1px 0 rgba(255,255,255,.22);
    text-shadow: 0 1px 2px rgba(0,0,0,.15);
}
.primary-button:hover {
    transform: translateY(-2px) scale(1.01);
    box-shadow: 0 10px 28px rgba(79, 70, 229, .30), 0 2px 6px rgba(79, 70, 229, .15);
    filter: brightness(1.06);
}
.primary-button:active { transform: translateY(0) scale(.98); }

.secondary-button,
.student-secondary-button,
.student-secondary-link {
    color: var(--ink-700);
    background: rgba(255,255,255,.78);
    border-color: var(--border-strong);
    box-shadow: var(--shadow-xs);
}
.secondary-button:hover,
.student-secondary-button:hover,
.student-secondary-link:hover {
    color: var(--primary-600);
    border-color: rgba(99,102,241,.25);
    background: #fff;
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm), 0 0 0 1px rgba(99, 102, 241, .06);
}

.danger-button {
    color: var(--rose-600);
    background: linear-gradient(135deg, #fff8f9, #fff0f2);
    border-color: rgba(225,29,72,.14);
}
.danger-button:hover {
    background: #ffecf0;
    border-color: rgba(225,29,72,.28);
    transform: translateY(-2px);
    box-shadow: 0 6px 18px rgba(225, 29, 72, .12);
}

.text-button, .inline-text-button {
    min-height: 36px;
    padding: 7px 11px;
    color: var(--primary-600);
    background: var(--primary-50);
    border-color: rgba(99,102,241,.10);
    font-size: .74rem;
}
.text-button:hover, .inline-text-button:hover {
    background: var(--primary-100);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(99, 102, 241, .10);
}
.compact-button { min-height: 40px; padding: 8px 13px; font-size: .79rem; }

/* ─── Messages ───────────────────────────────────────── */
.dashboard-message,
.form-message,
.student-form-message,
#student-login-message,
#admin-login-message,
#batch-student-message {
    margin: 0;
    color: var(--emerald-600);
    font-size: .75rem;
    font-weight: 660;
}
.error, .dashboard-message.error, .form-message.error, .student-form-message.error,
#student-login-message.error, #admin-login-message.error { color: var(--rose-600); }

/* ─── Panels ─────────────────────────────────────────── */
.panel,
.admin-panel,
.dashboard-panel,
.student-panel {
    min-width: 0;
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    background: rgba(255, 255, 255, .82);
    box-shadow: var(--shadow-sm);
    backdrop-filter: blur(20px) saturate(120%);
    -webkit-backdrop-filter: blur(20px) saturate(120%);
    transition: border-color var(--normal), box-shadow var(--normal);
}
.panel:hover,
.admin-panel:hover,
.dashboard-panel:hover,
.student-panel:hover {
    border-color: rgba(99, 102, 241, .08);
}

.panel-header,
.student-section-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 14px;
}
.panel-header p:last-child,
.student-section-header p:last-child { margin-bottom: 0; }

.empty-state,
.student-empty-state,
.compact-empty,
.students-empty-state {
    border: 1.5px dashed rgba(99,102,241,.16);
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, rgba(99,102,241,.03), rgba(6,182,212,.025));
    color: var(--ink-500);
    padding: 26px;
    text-align: center;
    font-size: .8rem;
}

.badge,
.library-result-count,
.student-status-badge,
.batch-status,
.course-price-pill {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    width: fit-content;
    min-height: 28px;
    border: 1px solid rgba(99, 102, 241, .12);
    border-radius: 999px;
    padding: 5px 10px;
    background: linear-gradient(135deg, var(--primary-50), rgba(238, 242, 255, .8));
    color: var(--primary-700);
    font-size: .67rem;
    font-weight: 780;
    white-space: nowrap;
    letter-spacing: .01em;
}

/* ─── Tables ─────────────────────────────────────────── */
.responsive-table { width: 100%; overflow: auto; -webkit-overflow-scrolling: touch; }
table { width: 100%; border-collapse: collapse; min-width: 680px; }
th, td { padding: 14px 15px; border-bottom: 1px solid var(--border); text-align: left; vertical-align: middle; }
th {
    color: var(--ink-500);
    background: rgba(243,246,252,.9);
    font-size: .65rem;
    font-weight: 800;
    letter-spacing: .07em;
    text-transform: uppercase;
}
td { color: var(--ink-700); font-size: .78rem; }
tbody tr { transition: background var(--fast), box-shadow var(--fast); }
tbody tr:hover {
    background: rgba(99,102,241,.025);
    box-shadow: inset 3px 0 0 var(--primary-400);
}
tbody tr:last-child td { border-bottom: 0; }

/* ─── Animations ─────────────────────────────────────── */
.dashboard-skeleton {
    height: 58px;
    border-radius: 14px;
    background: linear-gradient(90deg, #eaeff7 20%, #f5f8fc 42%, #eaeff7 64%);
    background-size: 220% 100%;
    animation: uiShimmer 1.4s linear infinite;
}

body.is-loading .summary-card,
body.is-loading .student-stat-card { animation: uiSoftPulse 1.5s ease-in-out infinite alternate; }

@keyframes uiShimmer { to { background-position: -220% 0; } }
@keyframes uiSoftPulse { from { opacity: .65; } to { opacity: 1; } }
@keyframes uiEnter { from { opacity: 0; transform: translateY(14px) scale(.98); } to { opacity: 1; transform: translateY(0) scale(1); } }
@keyframes uiFloat { 0%,100% { transform: translate3d(0,0,0); } 50% { transform: translate3d(0,-8px,0); } }
@keyframes uiGlow { 0%,100% { opacity: .35; transform: scale(.97); } 50% { opacity: .7; transform: scale(1.03); } }
@keyframes uiPulseGlow { 0%,100% { box-shadow: 0 0 8px rgba(99,102,241,.12); } 50% { box-shadow: 0 0 20px rgba(99,102,241,.25); } }
@keyframes uiSlideRight { from { opacity: 0; transform: translateX(-12px); } to { opacity: 1; transform: translateX(0); } }
@keyframes uiScaleIn { from { opacity: 0; transform: scale(.92); } to { opacity: 1; transform: scale(1); } }
@keyframes uiGradientShift {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}
@keyframes uiRotate { from { transform: rotate(0deg); } to { transform: rotate(360deg); } }

/* ─── Modal ──────────────────────────────────────────── */
.app-modal { position: fixed; inset: 0; z-index: 1000; display: grid; place-items: center; padding: max(20px, var(--safe-top)) max(20px, var(--safe-right)) max(20px, var(--safe-bottom)) max(20px, var(--safe-left)); }
.app-modal:not(.open) { display: none; }
body.modal-open { overflow: hidden; }
.app-modal-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(5, 13, 26, .62);
    backdrop-filter: blur(12px) saturate(110%);
    -webkit-backdrop-filter: blur(12px) saturate(110%);
}
.app-modal-card {
    position: relative;
    width: min(680px, 100%);
    max-height: min(84dvh, 760px);
    overflow: auto;
    border: 1px solid rgba(255,255,255,.15);
    border-radius: 26px;
    background: #fff;
    box-shadow: var(--shadow-xl);
    padding: 26px;
    animation: uiScaleIn .28s var(--spring) both;
}
.app-modal-close {
    position: absolute;
    top: 14px;
    right: 14px;
    width: 38px;
    height: 38px;
    display: grid;
    place-items: center;
    border: 1px solid var(--border);
    border-radius: 12px;
    background: rgba(255,255,255,.9);
    color: var(--ink-600);
    transition: background var(--fast), color var(--fast), transform var(--fast);
}
.app-modal-close:hover { background: var(--primary-50); color: var(--primary-600); transform: rotate(90deg); }

/* Menu helpers created by ui.js */
.ui-menu-toggle, .admin-sidebar-backdrop { display: none; }

/* ─── Responsive ─────────────────────────────────────── */
@media (max-width: 720px) {
    body { font-size: 14px; }
    h1 { font-size: 1.42rem; }
    h2 { font-size: 1.04rem; }
    .panel, .admin-panel, .dashboard-panel, .student-panel { border-radius: 20px; }
    .primary-button, .secondary-button, .danger-button, .student-secondary-button, .student-secondary-link { min-height: 46px; }
    .app-modal { padding: calc(var(--safe-top) + 12px) 12px calc(var(--safe-bottom) + 12px); }
    .app-modal-card { padding: 20px 16px; border-radius: 22px; max-height: 90dvh; }
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after { scroll-behavior: auto !important; animation-duration: .001ms !important; animation-iteration-count: 1 !important; transition-duration: .001ms !important; }
}

/* ─── Root Redirect ──────────────────────────────────── */
.redirect-page {
    min-height: 100dvh;
    display: grid;
    place-items: center;
    padding: max(20px,var(--safe-top)) max(16px,var(--safe-right)) max(20px,var(--safe-bottom)) max(16px,var(--safe-left));
    background:
        radial-gradient(ellipse at 30% 20%, rgba(99,102,241,.22), transparent 40%),
        radial-gradient(ellipse at 70% 80%, rgba(6,182,212,.14), transparent 40%),
        #050d1a;
}
.redirect-card {
    width: min(400px,100%);
    padding: 32px;
    border: 1px solid rgba(255,255,255,.10);
    border-radius: 28px;
    text-align: center;
    color: #dce7f7;
    background: rgba(255,255,255,.06);
    box-shadow: 0 28px 80px rgba(0,0,0,.36);
    backdrop-filter: blur(20px);
    animation: uiScaleIn .5s var(--spring) both;
}
.redirect-mark {
    width: 56px;
    height: 56px;
    display: grid;
    place-items: center;
    margin: 0 auto 18px;
    border-radius: 18px;
    color: white;
    background: linear-gradient(145deg, #6d70ff, #4338ca);
    font-weight: 900;
    box-shadow: 0 12px 32px rgba(79,70,229,.35);
    animation: uiPulseGlow 3s ease-in-out infinite;
}
.redirect-card h1 { color: white; font-size: 1.5rem; }
.redirect-card p { color: #8fa1ba; font-size: .76rem; }
.redirect-card a {
    display: inline-flex;
    margin-top: 8px;
    padding: 10px 16px;
    border-radius: 12px;
    color: white;
    background: linear-gradient(135deg, #5b52f0, #4338ca);
    font-size: .72rem;
    font-weight: 750;
    box-shadow: var(--shadow-glow);
    transition: transform var(--fast) var(--spring), box-shadow var(--normal);
}
.redirect-card a:hover { transform: translateY(-2px); box-shadow: var(--shadow-glow-lg); }

/* Adullam official eagle logo on the root redirect screen. */
.redirect-mark {
    background: transparent url("../assets/adullam-logo.png") center / contain no-repeat !important;
    border: 0 !important;
    border-radius: 50% !important;
    color: transparent !important;
    text-indent: -9999px !important;
    box-shadow: 0 8px 22px rgba(80,52,12,.18) !important;
}