/* 
   Solar Power Survey - Premium Design System 
   Font: Pretendard
*/
@import url('https://cdn.jsdelivr.net/gh/orioncactus/pretendard/dist/web/static/pretendard.css');

:root {
    /* Color Palette */
    --primary-color: #0056b3; /* Solar Blue */
    --primary-dark: #003d80;
    --accent-color: #28a745; /* Eco Green */
    --accent-light: #4cd964;
    --text-main: #1a1a1a;
    --text-light: #555555;
    --background-light: #f8f9fa;
    --white: #ffffff;
    --glass-bg: rgba(255, 255, 255, 0.85);
    --glass-border: rgba(255, 255, 255, 0.3);
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #0056b3 0%, #00a8e8 100%);
    --gradient-accent: linear-gradient(135deg, #28a745 0%, #84fab0 100%);
    --gradient-overlay: linear-gradient(to bottom, rgba(0,0,0,0.3), rgba(0,0,0,0.7));

    /* Shadows */
    --shadow-sm: 0 4px 6px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 10px 15px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 20px 25px rgba(0, 0, 0, 0.15);
    --shadow-glow: 0 0 20px rgba(40, 167, 69, 0.4);

    /* Spacing */
    --container-padding: 2rem;
    --border-radius: 16px;
    --transition-speed: 0.3s;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Pretendard', sans-serif;
    background-color: var(--background-light);
    color: var(--text-main);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    margin-bottom: 1rem;
    letter-spacing: -0.02em;
}

.text-gradient {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    display: inline-block;
}

.text-accent {
    color: var(--accent-color);
}

/* Layout Utilities */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

section {
    padding: 5rem 0;
}

/* Glassmorphism Card */
.glass-card {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition-speed), box-shadow var(--transition-speed);
}

.glass-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 1rem 2rem;
    border-radius: 50px;
    font-weight: 600;
    font-size: 1.1rem;
    cursor: pointer;
    transition: all var(--transition-speed);
    text-decoration: none;
    border: none;
    outline: none;
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--white);
    box-shadow: 0 4px 15px rgba(0, 86, 179, 0.3);
}

.btn-primary:hover {
    transform: scale(1.05);
    box-shadow: 0 8px 25px rgba(0, 86, 179, 0.4);
}

.btn-accent {
    background: var(--gradient-accent);
    color: var(--white);
    box-shadow: 0 4px 15px rgba(40, 167, 69, 0.3);
}

.btn-accent:hover {
    transform: scale(1.05);
    box-shadow: 0 8px 25px rgba(40, 167, 69, 0.4);
}

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.animate-up {
    animation: fadeInUp 0.8s ease-out forwards;
}