@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

/* ============================================
   APPLE LIQUID GLASS DESIGN SYSTEM
   ============================================ */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

body {
    width: 100%;
    height: 100vh;
    height: 100dvh;
    background: linear-gradient(135deg, #0a0a0f 0%, #1a1a2e 50%, #0f0f1a 100%);
    overflow-x: hidden;
}

/* ============================================
   CSS VARIABLES - LIQUID GLASS THEME
   ============================================ */

:root {
    /* Primary Colors */
    --main-color: #6366f1;
    --main-color-rgb: 99, 102, 241;
    --accent-gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #a855f7 100%);

    /* Glass Effect Colors */
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-bg-hover: rgba(255, 255, 255, 0.1);
    --glass-border: rgba(255, 255, 255, 0.1);
    --glass-border-hover: rgba(255, 255, 255, 0.2);
    --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    --glass-shadow-hover: 0 16px 48px rgba(0, 0, 0, 0.4);
    --glass-blur: blur(20px);
    --glass-blur-strong: blur(40px);

    /* Text Colors */
    --text-primary: rgba(255, 255, 255, 0.95);
    --text-secondary: rgba(255, 255, 255, 0.7);
    --text-muted: rgba(255, 255, 255, 0.4);

    /* Glow Effects */
    --glow-primary: 0 0 30px rgba(var(--main-color-rgb), 0.4);
    --glow-strong: 0 0 50px rgba(var(--main-color-rgb), 0.6);

    /* Animation Timing */
    --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-smooth: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);

    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;
}

/* ============================================
   SELECTION & SCROLLBAR
   ============================================ */

::selection {
    background: var(--main-color);
    color: white;
}

::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(180deg, var(--main-color), rgba(var(--main-color-rgb), 0.5));
    border-radius: var(--radius-full);
    border: 2px solid transparent;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--main-color);
}

/* ============================================
   GLASS BUTTON COMPONENT
   ============================================ */

.main-btn {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 12px;
    padding: 14px 28px;
    background: var(--accent-gradient);
    border: 1px solid rgba(255, 255, 255, 0.2);
    outline: none;
    color: white;
    fill: white;
    border-radius: var(--radius-lg);
    text-decoration: none;
    font-weight: 500;
    font-size: 15px;
    letter-spacing: 0.02em;
    cursor: pointer;
    position: relative;
    overflow: hidden;
    box-shadow: var(--glow-primary), var(--glass-shadow);
    transition: transform var(--transition-smooth),
        box-shadow var(--transition-smooth);
    will-change: transform, box-shadow;
}

.main-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left var(--transition-slow);
}

.main-btn:hover,
.main-btn:focus-visible {
    transform: translateY(-2px) scale(1.02);
    box-shadow: var(--glow-strong), var(--glass-shadow-hover);
}

.main-btn:hover::before {
    left: 100%;
}

.main-btn:active {
    transform: translateY(0) scale(0.98);
}

.main-btn svg {
    width: 18px;
    height: 18px;
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.2));
}

/* ============================================
   LINK STYLES
   ============================================ */

a {
    color: var(--text-primary);
    background: rgba(var(--main-color-rgb), 0.2);
    outline: none;
    padding: 2px 8px;
    border-radius: var(--radius-sm);
    text-decoration: none;
    transition: background var(--transition-fast),
        color var(--transition-fast);
}

a:hover,
a:focus-visible {
    color: white;
    background: var(--main-color);
}

/* ============================================
   LOADING OVERLAY - GLASS EFFECT
   ============================================ */

#loading {
    width: 100%;
    height: 100vh;
    height: 100dvh;
    position: fixed;
    place-items: center;
    z-index: 100;
    backdrop-filter: var(--glass-blur-strong);
    -webkit-backdrop-filter: var(--glass-blur-strong);
    background: rgba(0, 0, 0, 0.5);
    transition: opacity var(--transition-smooth);
    display: none;
}

#loading[data-loading] {
    display: grid;
}

#loading span {
    width: 56px;
    height: 56px;
    aspect-ratio: 1/1;
    border: 3px solid rgba(255, 255, 255, 0.1);
    border-top: 3px solid var(--main-color);
    border-radius: 50%;
    animation: rotate 0.8s infinite linear;
    box-shadow: var(--glow-primary);
}

@keyframes rotate {
    from {
        transform: rotate(0deg);
    }

    to {
        transform: rotate(360deg);
    }
}

/* ============================================
   CONTAINER ANIMATION
   ============================================ */

.container {
    animation: slideIn 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes slideIn {
    from {
        transform: translateY(-20px);
        opacity: 0;
    }

    to {
        transform: translateY(0);
        opacity: 1;
    }
}

/* ============================================
   MESSAGE NOTIFICATIONS - GLASS STYLE
   ============================================ */

#messages {
    position: fixed;
    padding: 16px;
    padding-bottom: 120px;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    align-items: flex-start;
    flex-wrap: wrap;
    gap: 12px;
    z-index: 50;
    pointer-events: none;
}

#messages .msg {
    min-width: 320px;
    height: fit-content;
    display: flex;
    justify-content: flex-start;
    align-items: center;
    gap: 16px;
    padding: 16px 20px;
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border);
    color: var(--text-primary);
    fill: var(--main-color);
    font-size: 15px;
    font-weight: 500;
    border-radius: var(--radius-lg);
    box-shadow: var(--glass-shadow);
    animation: fadeInOut var(--timeout, 10s) forwards;
}

#messages svg {
    width: 28px;
    height: 28px;
    aspect-ratio: 1/1;
    filter: drop-shadow(0 0 8px rgba(var(--main-color-rgb), 0.5));
}

@keyframes fadeInOut {
    0% {
        opacity: 0;
        transform: translateX(-20px);
    }

    15% {
        opacity: 1;
        transform: translateX(0);
    }

    85% {
        opacity: 1;
        transform: translateX(0);
    }

    100% {
        opacity: 0;
        transform: translateX(-20px);
    }
}

/* ============================================
   UTILITY CLASSES
   ============================================ */

.glass-panel {
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--glass-shadow);
}

.glass-card {
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-xl);
    box-shadow: var(--glass-shadow);
    transition: transform var(--transition-smooth),
        box-shadow var(--transition-smooth),
        border-color var(--transition-smooth);
}

.glass-card:hover {
    transform: translateY(-4px) scale(1.02);
    box-shadow: var(--glass-shadow-hover);
    border-color: var(--glass-border-hover);
}

/* GPU Acceleration Hint */
.gpu-accelerated {
    will-change: transform, opacity;
    transform: translateZ(0);
}