:root {
    --bg-mesh-1: #e0f2fe;
    --bg-mesh-2: #fdf4ff;
    --bg-mesh-3: #fef3c7;
    --text-primary: #1d1d1f;
    --text-secondary: #6e6e73;
    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-border: rgba(255, 255, 255, 0.9);
    --glass-shadow: 0 10px 40px rgba(0, 0, 0, 0.08);
    --accent: #0071e3;
    --accent-hover: #0077ed;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-mesh-1);
    background-image: 
        radial-gradient(at 0% 0%, var(--bg-mesh-2) 0px, transparent 50%),
        radial-gradient(at 100% 0%, var(--bg-mesh-3) 0px, transparent 50%),
        radial-gradient(at 100% 100%, var(--bg-mesh-2) 0px, transparent 50%),
        radial-gradient(at 0% 100%, var(--bg-mesh-1) 0px, transparent 50%);
    background-attachment: fixed;
    background-size: cover;
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    padding: 3rem 1rem;
    line-height: 1.5;
}

.app-container {
    width: 100%;
    max-width: 1100px;
}

header {
    text-align: center;
    margin-bottom: 3rem;
    animation: fadeInDown 0.8s cubic-bezier(0.2, 0.8, 0.2, 1);
}

header h1 {
    font-size: 3.5rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 0.5rem;
}

header p {
    color: var(--text-secondary);
    font-size: 1.2rem;
    font-weight: 500;
}

/* Loader */
.loader {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 30vh;
    animation: fadeIn 0.5s ease-out;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--glass-border);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 1rem;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

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

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

.hidden {
    display: none !important;
}

/* Liquid Glass Mixin */
.glass-panel {
    background: var(--glass-bg);
    backdrop-filter: blur(30px);
    -webkit-backdrop-filter: blur(30px);
    border: 1px solid var(--glass-border);
    box-shadow: var(--glass-shadow);
    border-radius: 24px;
}

/* Lists Container */
.lists-container {
    display: flex;
    flex-direction: column;
    gap: 3.5rem;
    animation: fadeIn 0.8s ease-out;
}

.list-section h2 {
    font-size: 2.2rem;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
    text-align: center;
    font-weight: 700;
}

.items-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: 1.2rem;
}

.item-card {
    background: var(--glass-bg);
    backdrop-filter: blur(30px);
    -webkit-backdrop-filter: blur(30px);
    border: 1px solid var(--glass-border);
    color: var(--text-primary);
    padding: 1.5rem 1rem;
    border-radius: 20px;
    text-align: center;
    font-weight: 600;
    font-size: 1.1rem;
    cursor: pointer;
    transition: all 0.4s cubic-bezier(0.2, 0.8, 0.2, 1);
    box-shadow: var(--glass-shadow);
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 90px;
}

.item-card:hover {
    transform: translateY(-6px) scale(1.03);
    box-shadow: 0 15px 30px rgba(0, 113, 227, 0.2);
    background: #fff;
    color: var(--accent);
}

/* Schedule View Additions */
.schedule-header-actions {
    display: flex;
    justify-content: flex-start;
    margin-bottom: 1rem;
    animation: fadeIn 0.5s ease-out;
}

.back-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    color: var(--text-primary);
    padding: 0.8rem 1.5rem;
    border-radius: 30px;
    font-family: inherit;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: var(--glass-shadow);
}

.back-btn:hover {
    background: var(--text-primary);
    color: #fff;
    transform: translateX(-5px);
}

.schedule-main-title {
    font-size: 2.8rem;
    margin-bottom: 2.5rem;
    text-align: center;
    color: var(--text-primary);
    font-weight: 700;
    animation: fadeInDown 0.6s ease-out;
}

/* Schedule Grid */
.schedule-grid {
    display: flex;
    flex-direction: column;
    gap: 3rem;
}

.day-container {
    padding: 2rem;
    animation: fadeIn 0.8s cubic-bezier(0.2, 0.8, 0.2, 1) backwards;
}

.day-header {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    font-size: 1.6rem;
    font-weight: 700;
    margin-bottom: 2rem;
    color: var(--text-primary);
}

.day-header svg {
    color: var(--accent);
}

/* Today Highlight */
.day-container.today-highlight {
    border: 2px solid var(--accent);
    box-shadow: 0 15px 40px rgba(0, 113, 227, 0.15);
    background: rgba(255, 255, 255, 0.85);
}

.today-badge {
    background: var(--accent);
    color: #fff;
    font-size: 0.85rem;
    font-weight: 700;
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-left: auto;
}

.lessons-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 1.5rem;
}

.lesson-card {
    padding: 1.5rem;
    transition: all 0.4s cubic-bezier(0.2, 0.8, 0.2, 1);
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    background: #ffffff99;
}

.lesson-card:hover {
    transform: translateY(-5px) scale(1.02);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.08);
    background: #ffffff;
}

.lesson-card::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 5px;
    background: var(--accent);
}

.lesson-header {
    display: flex;
    justify-content: flex-start;
    align-items: center;
    gap: 1rem;
}

.lesson-time {
    display: flex;
    align-items: center;
    font-size: 1.05rem;
    color: var(--text-primary);
    font-weight: 600;
}

.lesson-number {
    background: rgba(0, 113, 227, 0.1);
    color: var(--accent);
    padding: 0.3rem 0.8rem;
    border-radius: 8px;
    font-weight: 700;
    font-size: 0.9rem;
}

.lesson-title {
    font-size: 1.25rem;
    font-weight: 700;
    line-height: 1.3;
    letter-spacing: -0.01em;
}

.lesson-details {
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
    font-size: 1rem;
    color: var(--text-secondary);
    margin-top: auto;
    font-weight: 500;
}

.lesson-details span {
    display: flex;
    align-items: flex-start;
    gap: 0.6rem;
}

.lesson-details svg {
    width: 18px;
    height: 18px;
    opacity: 0.8;
    flex-shrink: 0;
    margin-top: 2px;
}

/* Parallel Lessons Styling */
.lesson-card.parallel-0 {
    background: rgba(255, 45, 85, 0.1);
    border-color: rgba(255, 45, 85, 0.3);
}
.lesson-card.parallel-0::before {
    background: #ff2d55;
}
.lesson-card.parallel-1 {
    background: rgba(90, 200, 250, 0.1);
    border-color: rgba(90, 200, 250, 0.3);
}
.lesson-card.parallel-1::before {
    background: #5ac8fa;
}

/* Error Message */
#error-message {
    text-align: center;
    padding: 3rem;
}

#error-message p {
    font-size: 1.2rem;
    font-weight: 600;
}

#retry-btn {
    background: var(--text-primary);
    color: #fff;
    border: none;
    padding: 1rem 2rem;
    border-radius: 30px;
    font-family: inherit;
    font-weight: 700;
    font-size: 1.1rem;
    margin-top: 1.5rem;
    cursor: pointer;
    transition: all 0.3s ease;
}

#retry-btn:hover {
    transform: scale(1.05);
}

/* Camera Button */
.camera-action-container {
    text-align: center;
    margin-bottom: 2rem;
    animation: fadeIn 0.8s ease-out;
}
.camera-btn {
    background: linear-gradient(135deg, #0071e3, #45a1ff);
    color: #fff;
    border: none;
    padding: 1.2rem 3rem;
    border-radius: 40px;
    font-size: 1.2rem;
    font-weight: 700;
    cursor: pointer;
    box-shadow: 0 10px 30px rgba(0, 113, 227, 0.4);
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 0.8rem;
}
.camera-btn:hover {
    transform: translateY(-3px) scale(1.02);
    box-shadow: 0 15px 40px rgba(0, 113, 227, 0.6);
}
.camera-btn:disabled {
    background: rgba(120, 120, 128, 0.3);
    cursor: not-allowed;
    box-shadow: none;
    transform: none;
    color: rgba(255, 255, 255, 0.5);
}
.face-status {
    margin-top: 1rem;
    font-size: 0.95rem;
    color: var(--text-secondary);
    font-weight: 600;
}

/* Camera Modal */
#camera-modal {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0,0,0,0.7);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    animation: fadeIn 0.3s ease-out;
}
.modal-content {
    background: var(--bg-mesh-1);
    padding: 2.5rem;
    border-radius: 30px;
    text-align: center;
    position: relative;
    width: 90%;
    max-width: 550px;
}
.close-btn {
    position: absolute;
    top: 15px;
    right: 20px;
    background: none;
    border: none;
    font-size: 2.5rem;
    line-height: 1;
    color: var(--text-primary);
    cursor: pointer;
}
.modal-content h2 {
    margin-bottom: 0.5rem;
}
.modal-content p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}
.video-container {
    position: relative;
    width: 100%;
    border-radius: 20px;
    overflow: hidden;
    background: #000;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
    aspect-ratio: 4/3;
    display: flex;
    align-items: center;
    justify-content: center;
}
video {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transform: scaleX(-1);
}
.face-overlay {
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    pointer-events: none;
}
.camera-status-text {
    margin-top: 1.5rem !important;
    font-weight: 700;
    font-size: 1.2rem;
    color: var(--accent) !important;
}

@media (max-width: 600px) {
    header h1 { font-size: 2.5rem; }
    .day-container { padding: 1.5rem 1rem; }
    .lessons-list { grid-template-columns: 1fr; }
    .items-grid { grid-template-columns: repeat(auto-fill, minmax(130px, 1fr)); }
}

@media (max-width: 768px) {
    .camera-action-container {
        display: none !important;
    }
}