/* CSS Variables */
:root {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-card: rgba(30, 41, 59, 0.7);
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent-color: #6366f1;
    --accent-hover: #4f46e5;
    --danger-color: #ef4444;
    --success-color: #22c55e;
    --border-color: rgba(255, 255, 255, 0.1);
    --glass-bg: rgba(30, 41, 59, 0.7);
    --glass-border: rgba(255, 255, 255, 0.1);
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header */
header {
    background: rgba(15, 23, 42, 0.8);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
    padding: 15px 0;
}

.header-content {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, #6366f1 0%, #a855f7 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    text-decoration: none;
}

/* Container */
.container {
    max-width: 800px;
    margin: 20px auto;
    padding: 0 20px;
    flex: 1;
    width: 100%;
}

/* Cards */
.card {
    background: var(--bg-card);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    padding: 20px;
    margin-bottom: 20px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 20px;
    border-radius: 12px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.2s ease;
    border: none;
    cursor: pointer;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-color) 0%, var(--accent-hover) 100%);
    color: white;
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 16px rgba(99, 102, 241, 0.4);
}

.btn-danger {
    background: rgba(239, 68, 68, 0.1);
    color: var(--danger-color);
    border: 1px solid rgba(239, 68, 68, 0.2);
}

.btn-danger:hover {
    background: rgba(239, 68, 68, 0.2);
}

.btn-icon {
    width: 42px;
    height: 42px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent-color);
    color: white;
    border: none;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-icon:hover {
    transform: scale(1.05);
}

/* Forms */
input[type="text"],
input[type="password"],
input[type="email"],
input[type="datetime-local"] {
    width: 100%;
    padding: 12px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    color: var(--text-primary);
    font-family: inherit;
    transition: all 0.2s ease;
}

input:focus {
    outline: none;
    border-color: var(--accent-color);
    background: rgba(255, 255, 255, 0.1);
}

/* Lists */
.item-list {
    list-style: none;
}

.item-list li {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 15px;
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: all 0.2s ease;
}

.item-list li:hover {
    background: rgba(255, 255, 255, 0.05);
    transform: translateX(2px);
}

.item-list li.completed {
    opacity: 0.6;
}

.item-list li.completed span {
    text-decoration: line-through;
    color: var(--text-secondary);
}

/* Checkbox */
input[type="checkbox"] {
    width: 20px;
    height: 20px;
    accent-color: var(--accent-color);
    cursor: pointer;
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.animate-fade-in {
    animation: fadeIn 0.3s ease-out forwards;
}

/* Footer */
footer {
    text-align: center;
    padding: 20px;
    color: var(--text-secondary);
    font-size: 0.8rem;
    margin-top: auto;
}

/* Bottom Nav */
.bottom-nav {
    display: none;
    /* Hidden on desktop */
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    background: rgba(15, 23, 42, 0.95);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-top: 1px solid var(--border-color);
    padding: 12px 30px;
    justify-content: space-between;
    align-items: center;
    z-index: 1000;
    padding-bottom: env(safe-area-inset-bottom, 20px);
}

.nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.75rem;
    gap: 4px;
    transition: color 0.2s;
}

.nav-item.active {
    color: var(--accent-color);
}

.nav-item i {
    width: 24px;
    height: 24px;
}

/* Mobile Optimizations */
@media (max-width: 600px) {
    .header-content {
        padding: 0 15px;
    }

    .desktop-only {
        display: none !important;
    }

    .desktop-text {
        display: none !important;
    }

    .mobile-icon {
        display: flex !important;
        align-items: center;
        justify-content: center;
    }

    .logout-btn {
        padding: 8px !important;
        width: 36px;
        height: 36px;
        border-radius: 12px;
    }

    .clock-display {
        font-size: 0.75rem !important;
    }

    .container {
        padding: 0 15px;
        margin: 15px auto;
        margin-bottom: 80px;
        /* Space for bottom nav */
    }

    .bottom-nav {
        display: flex;
    }

    .desktop-nav {
        /* Keep visible for logout/settings */
    }
}