/* CSS Variables for Theme Management */
:root {
    --bg-primary: #f0f4f8;
    --bg-secondary: #ffffff;
    --bg-card: #ffffff;
    --text-primary: #1a202c;
    --text-secondary: #4a5568;
    --accent-primary: #667eea;
    --accent-secondary: #764ba2;
    --shadow: rgba(0, 0, 0, 0.1);
    --border: #e2e8f0;
    --border-radius: 16px;
    --transition: all 0.3s cubic-bezier(0.4, 0.0, 0.2, 1);
}

body.dark-mode {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-card: #1e293b;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --shadow: rgba(0, 0, 0, 0.3);
    --border: #334155;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, var(--accent-primary) 0%, var(--accent-secondary) 100%);
    color: var(--text-primary);
    min-height: 100vh;
    padding: 20px;
    transition: var(--transition);
}

.controls-top {
    position: fixed;
    top: 20px;
    right: 20px;
    display: flex;
    gap: 10px;
    z-index: 1000;
}

body[dir="rtl"] .controls-top {
    right: auto;
    left: 20px;
}

.control-btn {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    border: none;
    background: var(--bg-card);
    color: var(--text-primary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    box-shadow: 0 4px 12px var(--shadow);
    transition: var(--transition);
}

.control-btn:hover {
    transform: translateY(-3px) scale(1.05);
    box-shadow: 0 6px 20px var(--shadow);
}

.container {
    max-width: 900px;
    margin: 80px auto 40px;
    background: var(--bg-card);
    border-radius: var(--border-radius);
    box-shadow: 0 20px 60px var(--shadow);
    padding: 40px;
    animation: fadeInUp 0.6s ease-out;
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}

header {
    text-align: center;
    margin-bottom: 40px;
}

.icon-wrapper {
    width: 80px;
    height: 80px;
    margin: 0 auto 20px;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

.icon-wrapper i {
    font-size: 2.5rem;
    color: white;
}

h1 {
    font-size: 2.5rem;
    font-weight: bold;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 10px;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.input-section label {
    display: block;
    margin-bottom: 12px;
    font-weight: 600;
    color: var(--text-primary);
}

.input-group {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
}

#birthDate {
    flex: 1;
    min-width: 200px;
    padding: 15px 20px;
    border: 2px solid var(--border);
    border-radius: 12px;
    font-size: 1rem;
    background: var(--bg-secondary);
    color: var(--text-primary);
    transition: var(--transition);
}

#birthDate:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.btn-calculate {
    padding: 15px 35px;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: white;
    border: none;
    border-radius: 12px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 10px;
    transition: var(--transition);
}

.btn-calculate:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(102, 126, 234, 0.3);
}

.results-section.hidden {
    display: none;
}

.age-display {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 20px;
    margin-bottom: 40px;
}

.age-card {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    padding: 30px 20px;
    border-radius: var(--border-radius);
    text-align: center;
    color: white;
    box-shadow: 0 10px 30px var(--shadow);
    transition: var(--transition);
}

.age-card:hover {
    transform: translateY(-5px);
}

.age-label {
    display: block;
    font-size: 0.9rem;
    opacity: 0.9;
    margin-bottom: 10px;
}

.age-value {
    display: block;
    font-size: 3rem;
    font-weight: bold;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 40px;
}

.stat-item {
    background: var(--bg-secondary);
    padding: 20px;
    border-radius: 12px;
    border: 2px solid var(--border);
    display: flex;
    align-items: center;
    gap: 15px;
    transition: var(--transition);
}

.stat-item:hover {
    border-color: var(--accent-primary);
}

.stat-item i {
    font-size: 2rem;
    color: var(--accent-primary);
}

.stat-label {
    display: block;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.stat-value {
    display: block;
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--text-primary);
}

.birthday-section {
    background: linear-gradient(135deg, #ffeaa7, #fdcb6e);
    padding: 30px;
    border-radius: var(--border-radius);
    text-align: center;
    margin-bottom: 30px;
}

.birthday-icon {
    font-size: 3rem;
    animation: bounce 2s ease-in-out infinite;
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

.countdown {
    display: flex;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
    margin: 20px 0;
}

.countdown-item {
    background: white;
    padding: 15px 25px;
    border-radius: 12px;
    min-width: 100px;
}

.countdown-value {
    display: block;
    font-size: 2rem;
    font-weight: bold;
    color: #2d3436;
}

.countdown-label {
    display: block;
    font-size: 0.9rem;
    color: #636e72;
}

.zodiac-section {
    background: var(--bg-secondary);
    padding: 30px;
    border-radius: var(--border-radius);
    border: 2px solid var(--border);
    text-align: center;
}

.zodiac-icon {
    font-size: 3rem;
    color: var(--accent-primary);
}

.zodiac-name {
    font-size: 1.8rem;
    font-weight: bold;
    color: var(--accent-primary);
}

footer {
    text-align: center;
    padding: 20px;
    color: white;
}

@media (max-width: 768px) {
    .container { padding: 25px; margin: 60px 10px 20px; }
    h1 { font-size: 2rem; }
    .input-group { flex-direction: column; }
    .btn-calculate { width: 100%; justify-content: center; }
}