/* frontend/static/css/main.css */

/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Colors */
    --primary-gradient-start: #667eea;
    --primary-gradient-end: #764ba2;
    --text-dark: #1a1a2e;
    --text-gray: #4a5568;
    --text-light: #9ca3af;
    --bg-gray: #f8f9fa;
    --white: #ffffff;
    --border: #e5e7eb;

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

    /* Border Radius */
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background-color: var(--bg-gray);
    color: var(--text-dark);
    line-height: 1.5;
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* Header Styles */
.header {
    background: var(--white);
    box-shadow: var(--shadow-sm);
    padding: var(--spacing-md) 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo h1 {
    font-size: 28px;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-gradient-start), var(--primary-gradient-end));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.logo a {
    text-decoration: none;
}

.nav {
    display: flex;
    gap: var(--spacing-xl);
}

.nav a {
    text-decoration: none;
    color: var(--text-gray);
    font-weight: 500;
    transition: color 0.2s;
}

.nav a:hover,
.nav a.active {
    color: var(--primary-gradient-start);
}

/* Footer Styles */
.footer {
    background: var(--white);
    border-top: 1px solid var(--border);
    padding: var(--spacing-xl) 0;
    text-align: center;
    color: var(--text-light);
    margin-top: var(--spacing-3xl);
}

/* Loading Overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(4px);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 9999;
}

.loader {
    width: 50px;
    height: 50px;
    border: 3px solid rgba(255, 255, 255, 0.2);
    border-top: 3px solid var(--primary-gradient-start);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: var(--spacing-lg);
}

.loading-overlay p {
    color: var(--white);
    font-size: 16px;
    font-weight: 500;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Utility Classes */
.text-center { text-align: center; }
.mt-1 { margin-top: var(--spacing-sm); }
.mt-2 { margin-top: var(--spacing-md); }
.mb-1 { margin-bottom: var(--spacing-sm); }
.mb-2 { margin-bottom: var(--spacing-md); }

/* ── Header with search variant ────────────────────────────── */
.header--with-search .header__inner {
    display: flex;
    align-items: center;
    gap: 24px;
}

.header__search {
    flex: 1;
    max-width: 520px;
    display: flex;
    align-items: center;
    background: #fff;
    border: 1.5px solid #e5e7eb;
    border-radius: 50px;
    padding: 5px 5px 5px 16px;
    gap: 10px;
    transition: border-color .2s, box-shadow .2s;
}

.header__search:focus-within {
    border-color: #1a3bc1;
    box-shadow: 0 0 0 3px rgba(26,59,193,.1);
}

.header__search-icon {
    color: #9ca3af;
    flex-shrink: 0;
}

.header__search input {
    flex: 1;
    border: none;
    background: transparent;
    font-size: 14px;
    outline: none;
    color: #111827;
    padding: 8px 0;
    min-width: 0;
}

.header__search input::placeholder { color: #9ca3af; }

.header__search-btn {
    background: #1a3bc1;
    border: none;
    border-radius: 50px;
    cursor: pointer;
    color: #fff;
    display: flex;
    align-items: center;
    padding: 8px 18px;
    font-size: 13px;
    font-weight: 600;
    font-family: inherit;
    transition: background .2s;
    white-space: nowrap;
    flex-shrink: 0;
}

.header__search-btn:hover { background: #1530a0; }

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 0 var(--spacing-md);
    }

    .logo h1 {
        font-size: 22px;
    }

    .nav {
        gap: var(--spacing-md);
    }

    .nav a {
        font-size: 14px;
    }
}