/* Smartboard Specific Styling */

body {
    width: 100vw;
    height: 100vh;
    overflow-x: hidden;
    scroll-behavior: smooth;
    scroll-snap-type: y mandatory;
    background: linear-gradient(135deg, var(--color-bg-light) 0%, #f0ede5 100%);
}

body.drawing-mode {
    overflow: hidden;
    scroll-behavior: auto;
    scroll-snap-type: none;
}

/* Loader */
.loader-container {
    height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    color: var(--color-primary);
}
.spinner {
    width: 50px;
    height: 50px;
    border: 5px solid rgba(128, 0, 32, 0.2);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 20px;
}
@keyframes spin { 100% { transform: rotate(360deg); } }

/* Content Sections */
#content-container section {
    min-height: 100vh;
    width: 100vw;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 4rem 5%;
    scroll-snap-align: start;
    position: relative;
}

/* Subtle separator between slides */
#content-container section:not(:last-child)::after {
    content: '';
    position: absolute;
    bottom: 0;
    width: 80%;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--color-secondary), transparent);
}

.container {
    width: 100%;
    max-width: 1600px;
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 1s ease, transform 1s cubic-bezier(0.25, 0.8, 0.25, 1);
}
.container.animate-in {
    opacity: 1;
    transform: translateY(0);
}

/* Typography Scale for Smartboard */
h1 {
    font-size: 5rem;
    color: var(--color-primary);
    text-align: center;
    margin-bottom: 2rem;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.05);
    letter-spacing: -1px;
}
h2 {
    font-size: 3.5rem;
    color: var(--color-primary);
    margin-bottom: 2rem;
    position: relative;
    display: inline-block;
}
h2::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 0;
    width: 60%;
    height: 4px;
    background: var(--color-secondary);
    border-radius: 2px;
}
p, li {
    font-size: 2.5rem;
    color: var(--color-text-main);
    margin-bottom: 1.8rem;
    font-weight: 400;
}

/* Premium Cards */
.card-container {
    display: flex;
    gap: 3rem;
    justify-content: center;
    flex-wrap: wrap;
    margin-top: 3rem;
}
.card {
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    padding: 4rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    flex: 1;
    min-width: 400px;
    transition: var(--transition-normal);
    position: relative;
    overflow: hidden;
}
.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 6px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
}
.card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
}
.card h3 {
    font-size: 2.2rem;
    color: var(--color-primary);
    margin-top: 0;
    margin-bottom: 1.5rem;
    word-break: break-word; /* Prevent awkward wrapping */
}

/* Math / Highlight Box */
.math-box {
    background: #ffffff;
    padding: 4rem;
    border-radius: var(--radius-lg);
    border-left: 12px solid var(--color-text-main);
    margin-top: 3rem;
    box-shadow: var(--shadow-sm);
}
.math-box h3 {
    font-size: 3.2rem;
    color: var(--color-text-main);
}

/* Writable Notes */
.student-notes {
    background-color: var(--color-surface);
    border: 2px dashed var(--color-secondary-light);
    padding: 4rem;
    border-radius: var(--radius-lg);
    width: 100%;
    box-shadow: inset 0 0 30px rgba(212, 175, 55, 0.05);
}
.student-notes h2 {
    text-align: center;
    border-bottom: none;
    margin-bottom: 4rem;
}
.student-notes h2::after { display: none; }
.student-notes p, .student-notes li {
    font-family: serif;
    font-size: 2.2rem;
    line-height: 1.9;
}

/* Drawing Canvas & Toolbar */
#drawing-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    pointer-events: none;
    z-index: 999;
}
body.drawing-mode #drawing-canvas {
    pointer-events: auto;
    cursor: crosshair;
}

#drawing-toolbar {
    display: none;
    position: fixed;
    top: 30px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    padding: 15px 30px;
    border-radius: var(--radius-round);
    box-shadow: var(--shadow-lg);
    border: 1px solid rgba(255,255,255,0.5);
    z-index: 1001;
    gap: 20px;
    align-items: center;
    animation: slideDown 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}
@keyframes slideDown {
    from { transform: translate(-50%, -100%); opacity: 0; }
    to { transform: translate(-50%, 0); opacity: 1; }
}

body.drawing-mode #drawing-toolbar {
    display: flex;
}

.color-picker {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: 3px solid white;
    box-shadow: 0 2px 5px rgba(0,0,0,0.2);
    cursor: pointer;
    transition: var(--transition-fast);
}
.color-picker.active {
    transform: scale(1.2);
    box-shadow: 0 4px 10px rgba(0,0,0,0.3);
}

#clear-btn {
    background: var(--color-danger);
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: var(--radius-round);
    cursor: pointer;
    font-weight: 600;
    font-size: 1.5rem;
    transition: var(--transition-fast);
    font-family: var(--font-heading);
}
#clear-btn:hover {
    background: #c0392b;
    transform: translateY(-2px);
}

.nav-hint {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background: rgba(26, 26, 46, 0.85);
    backdrop-filter: blur(5px);
    color: white;
    padding: 10px 20px;
    border-radius: var(--radius-round);
    font-size: 1.4rem;
    z-index: 998; /* Below canvas */
    box-shadow: var(--shadow-md);
    border: 1px solid rgba(255,255,255,0.1);
    pointer-events: none;
    transition: opacity 0.3s ease;
}