/* ===== Theme Variables =====
   Palette retuned to a "Dark Neon Cherry Blossom" style (deep violet +
   neon pink + sakura, glassmorphism cards with glow) — same variable
   names as before so every existing component picks up the new look
   automatically; only the values changed. */
:root {
    /* Dark theme (default) */
    --bg-body-1: #0d0820;
    --bg-body-2: #160d30;
    --bg-body-3: #1a0d35;
    --bg-card: rgba(26, 10, 60, 0.62);
    --bg-card-alt: rgba(255,255,255,0.06);
    --bg-input: rgba(20, 10, 45, 0.85);
    --bg-option: rgba(35, 16, 70, 0.85);
    --bg-option-hover: rgba(50, 22, 95, 0.85);
    --bg-stat: rgba(255,255,255,0.06);
    --bg-section-hover: rgba(255,255,255,0.06);
    --bg-widget: rgba(26,10,60,0.72);
    --bg-widget-panel: rgba(26,10,60,0.90);
    --bg-msg-item: rgba(255,255,255,0.04);
    --bg-guide-icon: rgba(192,132,252,0.14);
    --bg-mistake-header: rgba(192,132,252,0.1);
    --bg-mistake-item: rgba(255,255,255,0.03);
    --bg-stats-tile: rgba(192,132,252,0.08);
    --bg-stats-chart: rgba(255,255,255,0.03);
    --bg-result-th: rgba(20,10,45,0.95);
    --bg-splash: linear-gradient(160deg, #0d0820 0%, #160d30 50%, #1a0d35 100%);
    --text: #f0e6ff;
    --text-secondary: rgba(240,230,255,0.75);
    --text-muted: rgba(196,174,232,0.5);
    --text-label: rgba(240,230,255,0.62);
    --text-accent: #c4aee8;
    --text-pink: #fbb6ce;
    --text-dim: rgba(196,174,232,0.5);
    --text-dim2: rgba(196,174,232,0.62);
    --text-hint: #c084fc;
    --border-card: rgba(192,132,252,0.30);
    --border-light: rgba(255,255,255,0.15);
    --border-subtle: rgba(192,132,252,0.12);
    --border-section: rgba(192,132,252,0.14);
    --border-input: rgba(192,132,252,0.28);
    --border-option: rgba(192,132,252,0.28);
    --accent-pink: #f472b6;
    --accent-purple: #a855f7;
    --accent-light-purple: #c084fc;
    --accent-pink-rgb: 244,114,182;
    --accent-purple-rgb: 168,85,247;
    --accent-green: #6ee7b7;
    --accent-red: #fca5a5;
    --accent-yellow: #fbbf24;
    --shadow-card: 0 0 24px rgba(244,114,182,0.10), 0 8px 32px rgba(0,0,0,0.35);
    --shadow-card-inset: inset 0 1px 0 rgba(255,255,255,0.06);
    --header-bg: linear-gradient(135deg, rgba(244,114,182,0.22), rgba(168,85,247,0.22), rgba(192,132,252,0.16));
    --header-border: rgba(244,114,182,0.28);
    --nav-border: rgba(244,114,182,0.35);
    --lang-pill-bg: rgba(255,255,255,0.08);
    --lang-pill-border: rgba(192,132,252,0.20);
    --lang-pill-text: rgba(240,230,255,0.65);
    --guide-section-bg: rgba(255,255,255,0.03);
    --guestbook-msg-text: rgba(240,230,255,0.85);
    --guestbook-msg-time: rgba(196,174,232,0.45);
    --guestbook-loading: rgba(196,174,232,0.5);
    --about-tagline: rgba(240,230,255,0.75);
    --about-section-border: rgba(255,255,255,0.1);
    --about-text: rgba(240,230,255,0.85);
    --bg-about-section: rgba(255,255,255,0.03);
    --theme-toggle-bg: rgba(255,255,255,0.08);
    --theme-toggle-border: rgba(192,132,252,0.22);
    --glass-blur: 12px;
}

[data-theme="light"] {
    --bg-body-1: #faf5ff;
    --bg-body-2: #f3e8ff;
    --bg-body-3: #fdf2f8;
    --bg-card: rgba(255, 255, 255, 0.72);
    --bg-card-alt: rgba(168,85,247,0.06);
    --bg-input: rgba(255, 255, 255, 0.85);
    --bg-option: rgba(250, 245, 255, 0.85);
    --bg-option-hover: rgba(243, 232, 255, 0.9);
    --bg-stat: rgba(168,85,247,0.06);
    --bg-section-hover: rgba(168,85,247,0.08);
    --bg-widget: rgba(255,255,255,0.78);
    --bg-widget-panel: rgba(255,255,255,0.92);
    --bg-msg-item: rgba(168,85,247,0.04);
    --bg-guide-icon: rgba(168,85,247,0.08);
    --bg-mistake-header: rgba(168,85,247,0.08);
    --bg-mistake-item: rgba(168,85,247,0.03);
    --bg-stats-tile: rgba(168,85,247,0.06);
    --bg-stats-chart: rgba(168,85,247,0.03);
    --bg-result-th: rgba(255,255,255,0.9);
    --bg-splash: linear-gradient(160deg, #faf5ff 0%, #f3e8ff 50%, #fdf2f8 100%);
    --text: #3b1a5c;
    --text-secondary: rgba(59,26,92,0.72);
    --text-muted: rgba(124,58,183,0.5);
    --text-label: rgba(59,26,92,0.62);
    --text-accent: #9333ea;
    --text-pink: #db2777;
    --text-dim: rgba(124,58,183,0.5);
    --text-dim2: rgba(124,58,183,0.62);
    --text-hint: #9333ea;
    --border-card: rgba(192,132,252,0.35);
    --border-light: rgba(147,51,234,0.12);
    --border-subtle: rgba(192,132,252,0.15);
    --border-section: rgba(192,132,252,0.16);
    --border-input: rgba(192,132,252,0.30);
    --border-option: rgba(192,132,252,0.30);
    --accent-pink: #db2777;
    --accent-purple: #9333ea;
    --accent-light-purple: #a855f7;
    --accent-pink-rgb: 219,39,119;
    --accent-purple-rgb: 147,51,234;
    --accent-green: #059669;
    --accent-red: #dc2626;
    --accent-yellow: #d97706;
    --shadow-card: 0 2px 18px rgba(219,39,119,0.10), 0 8px 28px rgba(147,51,234,0.08);
    --shadow-card-inset: inset 0 1px 0 rgba(255,255,255,0.9);
    --header-bg: linear-gradient(135deg, rgba(219,39,119,0.10), rgba(147,51,234,0.10), rgba(192,132,252,0.08));
    --header-border: rgba(147,51,234,0.18);
    --nav-border: rgba(219,39,119,0.28);
    --lang-pill-bg: rgba(147,51,234,0.06);
    --lang-pill-border: rgba(147,51,234,0.18);
    --lang-pill-text: rgba(59,26,92,0.62);
    --guide-section-bg: rgba(147,51,234,0.04);
    --guestbook-msg-text: rgba(59,26,92,0.85);
    --guestbook-msg-time: rgba(124,58,183,0.42);
    --guestbook-loading: rgba(124,58,183,0.5);
    --about-tagline: rgba(59,26,92,0.72);
    --about-section-border: rgba(147,51,234,0.14);
    --about-text: rgba(59,26,92,0.85);
    --bg-about-section: rgba(147,51,234,0.035);
    --theme-toggle-bg: rgba(147,51,234,0.07);
    --theme-toggle-border: rgba(147,51,234,0.18);
    --glass-blur: 10px;
}

/* Smooth transition */
*, *::before, *::after {
    transition: background-color 0.3s ease, border-color 0.3s ease, color 0.3s ease, box-shadow 0.3s ease;
}

/* ─── Ambient background glow (behind all content, above the base body
   gradient set in base.css) — layered radial blooms + a slow-pulsing
   orb, same idea as the Bolt reference design. ─── */
body::before {
    content: '';
    position: fixed;
    inset: 0;
    background:
        radial-gradient(ellipse 70% 55% at 20% 30%, rgba(168,85,247,0.16) 0%, transparent 70%),
        radial-gradient(ellipse 60% 45% at 80% 70%, rgba(244,114,182,0.12) 0%, transparent 65%),
        radial-gradient(ellipse 50% 40% at 50% 10%, rgba(192,132,252,0.10) 0%, transparent 60%);
    pointer-events: none;
    z-index: 0;
}
[data-theme="light"] body::before {
    background:
        radial-gradient(ellipse 70% 55% at 20% 30%, rgba(168,85,247,0.10) 0%, transparent 70%),
        radial-gradient(ellipse 60% 45% at 80% 70%, rgba(219,39,119,0.08) 0%, transparent 65%),
        radial-gradient(ellipse 50% 40% at 50% 10%, rgba(192,132,252,0.07) 0%, transparent 60%);
}

body::after {
    content: '';
    position: fixed;
    width: 520px;
    height: 520px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(168,85,247,0.10) 0%, transparent 70%);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation: orb-pulse 8s ease-in-out infinite;
    pointer-events: none;
    z-index: 0;
}
[data-theme="light"] body::after {
    background: radial-gradient(circle, rgba(192,132,252,0.08) 0%, transparent 70%);
}

@keyframes orb-pulse {
    0%, 100% { transform: translate(-50%, -50%) scale(1); opacity: 0.7; }
    50% { transform: translate(-50%, -50%) scale(1.18); opacity: 1; }
}

/* Theme toggle button — sliding day/night pill switch */
.theme-toggle {
    background: none;
    border: none;
    padding: 0;
    cursor: pointer;
    display: flex;
    align-items: center;
    flex-shrink: 0;
    transition: transform 0.3s cubic-bezier(0.34,1.56,0.64,1);
}
.theme-toggle:hover { transform: scale(1.06); }

.theme-toggle-track {
    position: relative;
    width: 56px;
    height: 28px;
    border-radius: 999px;
    box-sizing: border-box;
    background: linear-gradient(135deg, #ffb199, #f472b6 70%);
    box-shadow: 0 0 14px rgba(244,114,182,0.4), inset 0 1px 2px rgba(255,255,255,0.5);
    transition: background 0.4s ease, box-shadow 0.4s ease;
}
html[data-theme="dark"] .theme-toggle-track {
    background: linear-gradient(135deg, #2e2a6b, #7c3aed 75%);
    box-shadow: 0 0 14px rgba(168,85,247,0.5), inset 0 1px 2px rgba(0,0,0,0.35);
}

.theme-toggle-thumb {
    position: absolute;
    top: 3px;
    left: 3px;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: radial-gradient(circle at 30% 30%, #fff, #ffe9c7 75%);
    box-shadow: 0 2px 4px rgba(0,0,0,0.25);
    transition: transform 0.4s cubic-bezier(0.34,1.56,0.64,1), background 0.4s ease;
    z-index: 2;
}
html[data-theme="dark"] .theme-toggle-thumb {
    transform: translateX(26px);
    background: radial-gradient(circle at 30% 30%, #f3f0ff, #c4b5fd 75%);
}

.theme-toggle-icon {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 16px;
    height: 16px;
    display: flex;
    opacity: 0;
    transition: opacity 0.3s ease;
    pointer-events: none;
}
.theme-toggle-icon svg { width: 100%; height: 100%; }
.theme-toggle-icon-sun { right: 5px; opacity: 1; }
.theme-toggle-icon-moon { left: 5px; opacity: 0; }
html[data-theme="dark"] .theme-toggle-icon-sun { opacity: 0; }
html[data-theme="dark"] .theme-toggle-icon-moon { opacity: 1; }

@media (prefers-reduced-motion: reduce) {
    .theme-toggle-thumb, .theme-toggle-track, .theme-toggle-icon {
        transition-duration: 0.15s;
    }
}