:root {
    --bg-color: #f8f9fa;
    --text-color: #212529;
    --text-color-light: #6c757d;
    --card-bg-color: #ffffff;
    --card-border-color: #e9ecef;
    --brand-grad-1: #4285F4;
    --brand-grad-2: #9b72cb;
    --button-bg: rgba(255, 255, 255, 0.7);
    --button-border: rgba(0, 0, 0, 0.1);
    --button-text: #333;
    --button-active-bg: #4285F4;
    --button-active-border: #4285F4;
    --button-active-text: #ffffff;
    --logo-bg: #f0f4ff;
    --logo-border: #dbe1ff;
    --logo-text: #4364c6;
}

.theme-dark {
    --bg-color: #131314;
    --text-color: #e0e0e0;
    --text-color-light: #888;
    --card-bg-color: #1e1f20;
    --card-border-color: rgba(255, 255, 255, 0.1);
    --brand-grad-1: #89b1ff;
    --brand-grad-2: #ad99ff;
    --button-bg: rgba(255, 255, 255, 0.05);
    --button-border: rgba(255, 255, 255, 0.15);
    --button-text: #e0e0e0;
    --button-active-bg: rgba(137, 177, 255, 0.2);
    --button-active-border: rgba(137, 177, 255, 0.5);
    --button-active-text: #e0e0e0;
    --logo-bg: #2a2c33;
    --logo-border: #3b3d46;
    --logo-text: #a8bbf0;
}

.theme-ocean {
    --bg-color: #f0f9ff;
    --text-color: #0c4a6e;
    --text-color-light: #3880a9;
    --card-bg-color: #ffffff;
    --card-border-color: #e0f2fe;
    --brand-grad-1: #0ea5e9;
    --brand-grad-2: #14b8a6;
    --button-active-bg: #0ea5e9;
    --button-active-border: #0ea5e9;
}

.theme-cyberpunk {
    --bg-color: #0d0c1d;
    --text-color: #c0c0ff;
    --text-color-light: #8080c0;
    --card-bg-color: rgba(10, 10, 30, 0.6);
    --card-border-color: #39388a;
    --brand-grad-1: #00f5d4;
    --brand-grad-2: #ff00ff;
    --button-bg: rgba(0, 245, 212, 0.05);
    --button-border: rgba(0, 245, 212, 0.2);
    --button-text: #c0c0ff;
    --button-active-bg: rgba(0, 245, 212, 0.2);
    --button-active-border: #00f5d4;
    --button-active-text: #ffffff;
    --logo-bg: rgba(0, 245, 212, 0.1);
    --logo-border: rgba(0, 245, 212, 0.3);
    --logo-text: #00f5d4;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    transition: background-color 0.3s, color 0.3s;
}

.theme-cyberpunk body {
    background-image: 
        linear-gradient(rgba(100, 100, 255, 0.05) 1px, transparent 1px),
        linear-gradient(90deg, rgba(100, 100, 255, 0.05) 1px, transparent 1px);
    background-size: 2rem 2rem;
}

body::after {
    content: "";
    position: fixed;
    top: 0; left: 0;
    width: 100vw;
    height: 100vh;
    background: url(data:image/png;base64,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);
    opacity: 0.04;
    pointer-events: none;
    z-index: -1;
}

.brand-gradient-text {
    background: -webkit-linear-gradient(45deg, var(--brand-grad-1), var(--brand-grad-2));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}
.card-bg {
    background-color: var(--card-bg-color);
    border: 1px solid var(--card-border-color);
}
.glass-button {
    background: var(--button-bg);
    border: 1px solid var(--button-border);
    color: var(--button-text);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    transition: all 0.2s ease;
}
.glass-button:hover {
    border-color: var(--brand-grad-1);
}
.glass-button.active {
    background: var(--button-active-bg);
    border-color: var(--button-active-border);
    color: var(--button-active-text);
    font-weight: 600;
}
.day-timeline { position: relative; padding-left: 90px; }
.timeline-line { position: absolute; left: 80px; top: 0; bottom: 0; width: 2px; background: var(--card-border-color); }
.class-card-timeline { position: absolute; left: 95px; right: 10px; border-radius: 12px; padding: 16px; cursor: pointer; transition: all 0.2s ease; border-left-width: 4px; }
.class-card-timeline:hover { transform: translateY(-2px); box-shadow: 0 10px 20px rgba(0,0,0,0.05); }
.time-marker { position: absolute; left: 0; font-size: 0.75rem; color: var(--text-color-light); font-weight: 500; }
.modal-backdrop { position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: rgba(0, 0, 0, 0.4); backdrop-filter: blur(5px); display: flex; justify-content: center; align-items: center; z-index: 50; }

.header-controls {
    position: absolute;
    top: 1rem;
    left: 1rem;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
    z-index: 10;
}
.cat-clock {
    position: absolute;
    top: 1rem;
    right: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.25rem 0.75rem;
    background-color: var(--card-bg-color);
    border: 1px solid var(--card-border-color);
    border-radius: 9999px;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-color);
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
}

.beta-logo { cursor: pointer; display: flex; align-items: center; gap: 0.3rem; padding: 0.25rem 0.6rem; background-color: var(--logo-bg); border: 1px solid var(--logo-border); border-radius: 9999px; font-size: 0.875rem; font-weight: 600; color: var(--logo-text); }
#theme-select { -webkit-appearance: none; -moz-appearance: none; appearance: none; background-image: none; padding-right: 1.5rem; background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%236b7280' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='M6 8l4 4 4-4'/%3e%3c/svg%3e"); background-position: right 0.5rem center; background-repeat: no-repeat; background-size: 1.25em 1.25em; }

/* Login Page Styles */
#login-container {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    text-align: center;
}
.login-card {
    background: var(--card-bg-color);
    border-radius: 20px;
    padding: 3rem 2.5rem;
    box-shadow: 0 20px 40px -10px rgba(0,0,0,0.1);
    border: 1px solid var(--card-border-color);
    max-width: 400px;
    width: 90%;
}
.google-login-button {
    background-color: #fff;
    color: #333;
    border: 1px solid #ddd;
    padding: 0.75rem 1.5rem;
    border-radius: 9999px;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    transition: all 0.2s ease-in-out;
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
}
.google-login-button:hover {
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    transform: translateY(-2px);
}
.logout-button {
    background: rgba(239, 68, 68, 0.2);
    border-color: rgba(239, 68, 68, 0.4);
    color: #f87171;
    font-weight: 600;
}
.logout-button:hover {
    background: rgba(239, 68, 68, 0.3);
    border-color: #ef4444;
    color: #ef4444;
}

/* User Info in Header */
#user-info {
    position: absolute;
    top: 1rem;
    right: 9rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    z-index: 10;
}
#user-info img {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: 2px solid var(--card-border-color);
}

@media (max-width: 768px) {
    .header-controls {
        position: static;
        width: 100%;
        flex-direction: row;
        justify-content: space-between;
        margin-bottom: 1rem;
    }
    .cat-clock {
        position: static;
        margin-top: -1.5rem;
        margin-bottom: 1rem;
        width: fit-content;
        margin-left: auto;
        margin-right: auto;
    }
    #user-info {
        position: static;
        justify-content: center;
        margin-bottom: 1rem;
    }
    .day-timeline { padding-left: 80px; }
    .class-card-timeline { left: 85px; }
    .time-marker { left: 10px; }
}