/* Global Modern Variables */
:root {
    --bg-gradient-1: #0f2027;
    --bg-gradient-2: #203a43;
    --bg-gradient-3: #2c5364;
    --primary-color: #6366f1;
    --primary-hover: #4f46e5;
    --danger-color: #ef4444;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
    --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
}

/* Base Body with Animated Gradient */
body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    color: var(--text-main);
    background: linear-gradient(-45deg, var(--bg-gradient-1), var(--bg-gradient-2), var(--bg-gradient-3), #1f1c2c);
    background-size: 400% 400%;
    animation: gradientBG 15s ease infinite;
    overflow: hidden;
    perspective: 1000px;
}

@keyframes gradientBG {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

/* Global Fade In Animation */
body > * {
    animation: fadeInSlideUp 0.8s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes fadeInSlideUp {
    0% {
        opacity: 0;
        transform: translateY(30px) scale(0.95);
    }
    100% {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

/* Glassmorphism Container */
.container {
    text-align: center;
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    padding: 50px;
    border-radius: 24px;
    box-shadow: var(--glass-shadow);
    position: relative;
    z-index: 10;
    max-width: 500px;
    width: 90%;
    transition: transform 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94), box-shadow 0.3s ease;
}

.container:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.4);
}

h1 {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 10px;
    background: linear-gradient(to right, #a8c0ff, #3f2b96);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: -1px;
}

p {
    color: var(--text-muted);
    font-size: 1.1rem;
    line-height: 1.6;
    margin-bottom: 40px;
}

/* Modern Dynamic Buttons */
button {
    padding: 16px 36px;
    font-size: 1.1rem;
    font-weight: 600;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 12px;
    cursor: pointer;
    position: relative;
    overflow: hidden;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.4);
    letter-spacing: 0.5px;
}

button::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 300%;
    height: 300%;
    background: rgba(255, 255, 255, 0.1);
    transform: translate(-50%, -50%) rotate(35deg) scale(0);
    transition: transform 0.5s ease;
}

button:hover {
    background: var(--primary-hover);
    transform: translateY(-2px) scale(1.02);
    box-shadow: 0 8px 25px rgba(99, 102, 241, 0.6);
}

button:hover::after {
    transform: translate(-50%, -50%) rotate(35deg) scale(1);
}

button:active {
    transform: translateY(1px) scale(0.98);
}

#btn-reset {
    background: var(--danger-color);
    box-shadow: 0 4px 15px rgba(239, 68, 68, 0.4);
}
#btn-reset:hover {
    background: #dc2626;
    box-shadow: 0 8px 25px rgba(239, 68, 68, 0.6);
}

#hidden-warning {
    display: none;
    color: #ff4757;
    font-weight: 800;
    margin-top: 25px;
    font-size: 1.5rem;
    animation: shake 0.5s ease-in-out infinite;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-5px) rotate(-2deg); }
    50% { transform: translateX(5px) rotate(2deg); }
    75% { transform: translateX(-5px) rotate(-2deg); }
}

/* Floating Particles (dibuat via JS nanti kalau mau) */
.particle {
    position: absolute;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    pointer-events: none;
    animation: floatUp 10s linear infinite;
}

@keyframes floatUp {
    0% { transform: translateY(100vh) scale(0); opacity: 0; }
    20% { opacity: 1; }
    80% { opacity: 1; }
    100% { transform: translateY(-20vh) scale(1.5); opacity: 0; }
}