:root {
    --background: #eef2f6;
    --surface: #ffffff;
    --surface-secondary: #f7f9fc;
    --text-primary: #1a202c;
    --text-secondary: #2d3748;
    --muted: #64748b;
    --border: #e2e8f0;
    --accent: #3182ce;
    --accent-hover: #2c5282;
    --success: #38a169;
    --danger: #e53e3e;
    --warning: #d69e2e;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.05);
    --shadow: 0 4px 6px rgba(0,0,0,0.05);
    --shadow-lg: 0 10px 15px rgba(0,0,0,0.05);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    --transition-fast: 0.15s ease;
    --transition: 0.25s ease;
    --transition-slow: 0.5s ease;
}

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

body {
    font-family: var(--font-family);
    background-color: var(--background);
    color: var(--text-primary);
    line-height: 1.5;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    transition: background-color 0.8s ease;
    overflow-x: hidden;
    position: relative;
}

/* Full-screen animated cloud background canvas */
#cloud-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: -1;
    pointer-events: none;
    display: block;
}

/* Container */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
    position: relative;
    z-index: 1;
}

/* Header with glassmorphism */
.app-header {
    background: rgba(255, 255, 255, 0.75);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    border-bottom: 1px solid rgba(255,255,255,0.3);
    padding: 0.75rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 4px 30px rgba(0,0,0,0.05);
    animation: fadeInDown 0.6s ease-out;
}

.header-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
    animation: fadeInDown 0.6s ease-out 0.1s both;
}

.logo-icon {
    width: 32px;
    height: 32px;
    animation: logo-float 3s ease-in-out infinite;
}

.logo-text {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent);
    letter-spacing: -0.5px;
}

@keyframes logo-float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-3px); }
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-wrap: wrap;
    animation: fadeInDown 0.6s ease-out 0.2s both;
}

/* Main */
main {
    flex: 1;
    padding: 1.5rem 0;
}

/* Footer with glassmorphism */
.app-footer {
    background: rgba(255, 255, 255, 0.75);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    border-top: 1px solid rgba(255,255,255,0.3);
    padding: 1.5rem 0;
    margin-top: auto;
    animation: fadeInUp 0.6s ease-out 0.4s both;
}

.footer-inner {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
}

.footer-brand {
    flex: 1;
    min-width: 200px;
}

.footer-logo {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--accent);
}

.footer-tagline {
    font-size: 0.9rem;
    color: var(--muted);
    margin-top: 0.25rem;
}

.footer-links {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.footer-links a {
    color: var(--accent);
    text-decoration: none;
    font-weight: 500;
    transition: color var(--transition-fast);
}

.footer-links a:hover {
    color: var(--accent-hover);
    text-decoration: underline;
}

.footer-copy {
    font-size: 0.9rem;
    color: var(--muted);
}

/* Utility */
.hidden {
    display: none !important;
}

/* Animation keyframes */
@keyframes fadeInDown {
    from { opacity: 0; transform: translateY(-20px); }
    to { opacity: 1; transform: translateY(0); }
}

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

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}