/* ============================================
   SAHIRA Visual Novel Engine — Design System
   Colorful Indonesian Tropical Palette
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Playfair+Display:ital,wght@0,400;0,700;1,400&family=Inter:wght@300;400;500;600&family=Outfit:wght@300;400;500;600;700&display=swap');

:root {
    /* ── Colorful Palette ── */
    --coral: #ff6b6b;
    --coral-dark: #ee5253;
    --teal: #00cec9;
    --teal-dark: #00b894;
    --gold: #fdcb6e;
    --gold-dark: #f0932b;
    --purple: #a29bfe;
    --purple-dark: #6c5ce7;
    --pink: #fd79a8;
    --pink-dark: #e84393;
    --sky: #74b9ff;
    --sky-dark: #0984e3;
    --mint: #55efc4;
    --mint-dark: #00b894;
    --peach: #fab1a0;
    --peach-dark: #e17055;
    --lavender: #dfe6e9;

    /* ── Gradients ── */
    --gradient-sunset: linear-gradient(135deg, #ff6b6b 0%, #ee5a24 25%, #f0932b 50%, #fdcb6e 100%);
    --gradient-ocean: linear-gradient(135deg, #00cec9 0%, #74b9ff 50%, #a29bfe 100%);
    --gradient-tropical: linear-gradient(135deg, #f0932b 0%, #fd79a8 33%, #a29bfe 66%, #00cec9 100%);
    --gradient-aurora: linear-gradient(135deg, #55efc4 0%, #74b9ff 33%, #a29bfe 66%, #fd79a8 100%);
    --gradient-twilight: linear-gradient(135deg, #2d3436 0%, #6c5ce7 50%, #e84393 100%);
    --gradient-rainbow: linear-gradient(90deg, #ff6b6b, #f0932b, #fdcb6e, #55efc4, #74b9ff, #a29bfe, #fd79a8);
    --gradient-card: linear-gradient(145deg, rgba(255,255,255,0.1) 0%, rgba(255,255,255,0.02) 100%);

    /* ── Backgrounds ── */
    --bg-deep: #0a0a1a;
    --bg-surface: rgba(15, 15, 40, 0.92);
    --bg-glass: rgba(255, 255, 255, 0.06);
    --bg-glass-hover: rgba(255, 255, 255, 0.12);
    --bg-dialogue: rgba(10, 10, 30, 0.88);

    /* ── Text ── */
    --text-primary: #ffffff;
    --text-secondary: rgba(255, 255, 255, 0.7);
    --text-muted: rgba(255, 255, 255, 0.4);

    /* ── Typography ── */
    --font-display: 'Playfair Display', Georgia, serif;
    --font-body: 'Inter', -apple-system, sans-serif;
    --font-heading: 'Outfit', -apple-system, sans-serif;

    /* ── Spacing ── */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 32px;
    --space-2xl: 48px;
    --space-3xl: 64px;

    /* ── Borders ── */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 999px;

    /* ── Shadows ── */
    --shadow-glow-pink: 0 0 20px rgba(253, 121, 168, 0.3);
    --shadow-glow-purple: 0 0 20px rgba(162, 155, 254, 0.3);
    --shadow-glow-teal: 0 0 20px rgba(0, 206, 201, 0.3);
    --shadow-glow-gold: 0 0 20px rgba(253, 203, 110, 0.3);
    --shadow-glow-coral: 0 0 20px rgba(255, 107, 107, 0.3);
    --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.3);
    --shadow-elevated: 0 16px 48px rgba(0, 0, 0, 0.4);

    /* ── Timing ── */
    --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
    --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
    --transition-fast: 0.2s var(--ease-out);
    --transition-normal: 0.4s var(--ease-out);
    --transition-slow: 0.8s var(--ease-out);
}

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

html, body {
    width: 100vw;
    height: 100vh;
    height: 100dvh;
    position: fixed;
    inset: 0;
    overflow: hidden;
    font-family: var(--font-body);
    color: var(--text-primary);
    background: var(--bg-deep);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    user-select: none;
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
}

/* ── Screen System ── */
.screen {
    position: fixed;
    inset: 0;
    width: 100vw;
    height: 100vh;
    height: 100dvh;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.6s var(--ease-out), visibility 0.6s;
    z-index: 1;
}

.screen.active {
    opacity: 1;
    visibility: visible;
    z-index: 10;
}

/* ── Utility ── */
.hidden { display: none !important; }
.visually-hidden { opacity: 0; pointer-events: none; }

/* ── Scrollbar ── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.15);
    border-radius: var(--radius-full);
}
::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.3);
}

/* ══════════════════════════════════════════
   Keyframe Animations
   ══════════════════════════════════════════ */

@keyframes fadeIn {
    from { opacity: 0; } to { opacity: 1; }
}
@keyframes fadeOut {
    from { opacity: 1; } to { opacity: 0; }
}
@keyframes slideUp {
    from { opacity: 0; transform: translateY(30px); }
    to   { opacity: 1; transform: translateY(0); }
}
@keyframes slideDown {
    from { opacity: 0; transform: translateY(-30px); }
    to   { opacity: 1; transform: translateY(0); }
}
@keyframes scaleIn {
    from { opacity: 0; transform: scale(0.92); }
    to   { opacity: 1; transform: scale(1); }
}
@keyframes pulse {
    0%, 100% { opacity: 1; } 50% { opacity: 0.5; }
}
@keyframes float {
    0%, 100% { transform: translateY(0); }
    50%      { transform: translateY(-10px); }
}
@keyframes shimmer {
    0%   { background-position: -200% 0; }
    100% { background-position: 200% 0; }
}
@keyframes gradientShift {
    0%   { background-position: 0% 50%; }
    50%  { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}
@keyframes borderGlow {
    0%, 100% { border-color: var(--coral);  box-shadow: var(--shadow-glow-coral); }
    25%      { border-color: var(--gold);   box-shadow: var(--shadow-glow-gold); }
    50%      { border-color: var(--teal);   box-shadow: var(--shadow-glow-teal); }
    75%      { border-color: var(--purple); box-shadow: var(--shadow-glow-purple); }
}
@keyframes bounceIndicator {
    0%, 100% { transform: translateY(0); }
    50%      { transform: translateY(5px); }
}
@keyframes rainbowText {
    0%   { color: var(--coral); }
    16%  { color: var(--gold); }
    33%  { color: var(--mint); }
    50%  { color: var(--sky); }
    66%  { color: var(--purple); }
    83%  { color: var(--pink); }
    100% { color: var(--coral); }
}
@keyframes slideFromLeft {
    from { transform: translateX(-60px); opacity: 0; }
    to   { transform: translateX(0); opacity: 1; }
}
@keyframes slideFromRight {
    from { transform: translateX(60px); opacity: 0; }
    to   { transform: translateX(0); opacity: 1; }
}

/* ══════════════════════════════════════════
   Shared Button Styles
   ══════════════════════════════════════════ */

.btn-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-md) var(--space-xl);
    font-family: var(--font-heading);
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    background: var(--gradient-tropical);
    background-size: 200% 200%;
    border: none;
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--transition-fast);
    animation: gradientShift 4s ease infinite;
    box-shadow: var(--shadow-glow-pink);
    letter-spacing: 0.03em;
}
.btn-primary:hover {
    transform: translateY(-2px) scale(1.02);
    box-shadow: 0 0 30px rgba(253, 121, 168, 0.5);
}
.btn-primary:active {
    transform: translateY(0) scale(0.98);
}
.btn-primary:disabled {
    opacity: 0.35;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
    animation: none;
}

.btn-secondary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-sm) var(--space-lg);
    font-family: var(--font-heading);
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
    background: var(--bg-glass);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--transition-fast);
}
.btn-secondary:hover {
    color: var(--text-primary);
    background: var(--bg-glass-hover);
    border-color: rgba(255, 255, 255, 0.2);
}

/* ══════════════════════════════════════════
   Toast Notification
   ══════════════════════════════════════════ */

.toast {
    position: fixed;
    top: var(--space-lg);
    left: 50%;
    transform: translateX(-50%) translateY(-20px);
    padding: var(--space-sm) var(--space-lg);
    font-family: var(--font-body);
    font-size: 0.85rem;
    color: var(--text-primary);
    background: var(--bg-surface);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-left: 3px solid var(--teal);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-card);
    z-index: 1000;
    opacity: 0;
    transition: all var(--transition-normal);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
}
.toast.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

/* ══════════════════════════════════════════
   Transition Overlay
   ══════════════════════════════════════════ */

.transition-overlay {
    position: fixed;
    inset: 0;
    background: var(--bg-deep);
    z-index: 100;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.5s var(--ease-in-out);
}
.transition-overlay.active {
    opacity: 1;
    pointer-events: all;
}