/* Base Styles */
:root {
    --primary: #4361ee;
    --primary-dark: #3a56d4;
    --secondary: #7209b7;
    --accent: #f72585;
    --light: #f8f9fa;
    --dark: #212529;
    --gray: #6c757d;
    --success: #4cc9f0;
    --border-radius: 12px;
    --shadow: 0 4px 20px rgba(0,0,0,0.1);
    --transition: all 0.3s ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background: linear-gradient(135deg, #f5f7fa 0%, #e4edf5 100%);
    color: var(--dark);
    line-height: 1.6;
    min-height: 100vh;
    padding-bottom: 60px;
}

a {
    text-decoration: none;
    color: var(--primary);
    transition: var(--transition);
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header Styles */
header {
    background: linear-gradient(120deg, var(--primary), var(--secondary));
    color: white;
    padding: 1.2rem 0;
    position: static !important;
    top: auto !important;
    z-index: auto !important;
    box-shadow: var(--shadow);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo i {
    font-size: 2.2rem;
    color: var(--success);
}

.logo h1 {
    font-size: 1.8rem;
    font-weight: 700;
}

.logo span {
    color: var(--success);
}

nav ul {
    display: flex;
    list-style: none;
    gap: 25px;
}

nav a {
    color: white;
    font-weight: 500;
    padding: 8px 12px;
    border-radius: 30px;
    transition: var(--transition);
}

nav a:hover, nav a.active {
    background: rgba(255,255,255,0.15);
}

.mobile-menu-btn {
    display: none;
    background: transparent;
    border: none;
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
}

/* Main Content Layout */
.content-wrapper {
    display: flex;
    gap: 30px;
    margin-top: 30px;
}

.main-content {
    flex: 1;
    background: white;
    border-radius: var(--border-radius);
    padding: 30px;
    box-shadow: var(--shadow);
}

.sidebar {
    width: 300px;
    background: white;
    border-radius: var(--border-radius);
    padding: 25px;
    box-shadow: var(--shadow);
    align-self: flex-start;
}

/* Timer Section */
.timer-section {
    text-align: center;
    padding: 30px 0;
    margin-bottom: 40px;
}

.timer-title {
    font-size: 2.2rem;
    margin-bottom: 20px;
    color: var(--primary-dark);
}

.timer-display {
    font-size: 5.5rem;
    font-weight: 700;
    color: var(--secondary);
    margin: 20px 0;
    letter-spacing: 3px;
    font-family: 'Courier New', monospace;
    text-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.timer-controls {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin: 30px 0;
}

.btn {
    padding: 14px 32px;
    font-size: 1.1rem;
    font-weight: 600;
    border: none;
    border-radius: 50px;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.btn-primary {
    background: var(--primary);
    color: white;
    box-shadow: 0 4px 15px rgba(67, 97, 238, 0.4);
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(67, 97, 238, 0.5);
}

.btn-secondary {
    background: white;
    color: var(--primary);
    border: 2px solid var(--primary);
}

.btn-secondary:hover {
    background: #f0f4ff;
}

.btn-accent {
    background: var(--accent);
    color: white;
}

.btn-accent:hover {
    background: #e61476;
    transform: translateY(-2px);
}

.progress-ring {
    margin: 0 auto;
    position: relative;
    width: 280px;
    height: 280px;
}

.progress-ring-circle {
    transform: rotate(-90deg);
    transform-origin: 50% 50%;
    transition: stroke-dashoffset 0.5s linear;
}

/* Features Section */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 25px;
    margin: 40px 0;
}

.feature-card {
    background: #f8f9ff;
    border-radius: var(--border-radius);
    padding: 25px;
    text-align: center;
    box-shadow: 0 3px 10px rgba(0,0,0,0.05);
    transition: var(--transition);
    border: 1px solid #eef2ff;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(67, 97, 238, 0.15);
}

.feature-icon {
    font-size: 2.5rem;
    color: var(--primary);
    margin-bottom: 15px;
}

.feature-card h3 {
    margin-bottom: 12px;
    color: var(--primary-dark);
}

/* Sidebar Styles */
.sidebar-title {
    font-size: 1.4rem;
    color: var(--secondary);
    margin-bottom: 20px;
    padding-bottom: 12px;
    border-bottom: 2px solid #f0f0f0;
}

.timer-list {
    list-style: none;
}

.timer-list li {
    margin-bottom: 15px;
}

.timer-list a {
    display: block;
    padding: 14px 18px;
    background: #f8f9ff;
    border-radius: var(--border-radius);
    font-weight: 500;
    color: var(--dark);
    transition: var(--transition);
    border-left: 4px solid var(--primary);
}

.timer-list a:hover {
    background: var(--primary);
    color: white;
    transform: translateX(5px);
}

.timer-list a i {
    margin-right: 10px;
    color: var(--gray);
}

.timer-list a:hover i {
    color: white;
}

.sidebar-tips {
    margin-top: 30px;
    background: #f0f7ff;
    padding: 20px;
    border-radius: var(--border-radius);
}

.sidebar-tips ul {
    list-style-type: circle;
    padding-left: 20px;
}

.sidebar-tips li {
    margin-bottom: 10px;
}

/* Popular Uses Section */
.section-title {
    font-size: 1.8rem;
    color: var(--primary-dark);
    margin: 40px 0 25px;
    text-align: center;
}

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

.use-card {
    background: white;
    border-radius: var(--border-radius);
    padding: 20px;
    text-align: center;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.use-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0,0,0,0.1);
}

.use-card i {
    font-size: 2.5rem;
    color: var(--accent);
    margin-bottom: 15px;
}

/* Footer Styles */
footer {
    background: linear-gradient(120deg, var(--dark), #1a1a2e);
    color: white;
    padding: 60px 0 30px;
    margin-top: 60px;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
}

.footer-column h3 {
    font-size: 1.4rem;
    margin-bottom: 25px;
    color: var(--success);
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: 12px;
}

.footer-links a {
    color: #b8c1ec;
    transition: var(--transition);
}

.footer-links a:hover {
    color: white;
    padding-left: 5px;
}

.social-links {
    display: flex;
    gap: 15px;
    margin-top: 20px;
}

.social-links a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: rgba(255,255,255,0.1);
    border-radius: 50%;
    color: white;
    transition: var(--transition);
}

.social-links a:hover {
    background: var(--primary);
    transform: translateY(-3px);
}

.copyright {
    text-align: center;
    padding-top: 30px;
    margin-top: 40px;
    border-top: 1px solid rgba(255,255,255,0.1);
    color: #b8c1ec;
    font-size: 0.9rem;
}

/* Responsive Styles */
@media (max-width: 992px) {
    .content-wrapper {
        flex-direction: column;
    }
    
    .sidebar {
        width: 100%;
    }
    
    .timer-display {
        font-size: 4rem;
    }
}

@media (max-width: 768px) {
    nav ul {
        display: none;
    }
    
    .mobile-menu-btn {
        display: block;
    }
    
    .timer-display {
        font-size: 3.5rem;
    }
    
    .progress-ring {
        width: 220px;
        height: 220px;
    }
    
    .timer-controls {
        flex-direction: column;
        align-items: center;
    }
    
    .btn {
        width: 100%;
        max-width: 300px;
        justify-content: center;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }
}

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

.pulse {
    animation: pulse 1.5s infinite;
}