/* ========================================
   LAYOUT - Header, Main, Footer
   ======================================== */

/* Header */
header {
    position: sticky;
    top: 0;
    background-color: var(--bg-primary);
    padding: var(--spacing-sm) var(--spacing-md);
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    align-items: center;
    border-bottom: 2px solid var(--text-primary);
    z-index: var(--z-header);
    transition: background-color var(--transition-normal);
}

.header-left {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-family: var(--font-body);
    font-size: 0.9rem;
    font-weight: 400;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    transition: color var(--transition-normal);
    justify-self: start;
}

.header-left > div:first-child {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    cursor: pointer;
}

.header-left:hover {
    color: var(--accent);
}

/* Volume Control */
.volume-control {
    display: flex;
    align-items: center;
    opacity: 1;
    transition: opacity 0.3s ease, width 0.3s ease;
}

.volume-control.hidden {
    opacity: 0;
    width: 0;
    overflow: hidden;
}

.volume-slider {
    -webkit-appearance: none;
    appearance: none;
    width: 80px;
    height: 4px;
    background: var(--text-primary);
    border-radius: 2px;
    outline: none;
    cursor: pointer;
}

.volume-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 12px;
    height: 12px;
    background: var(--accent);
    border-radius: 50%;
    cursor: pointer;
}

.volume-slider::-moz-range-thumb {
    width: 12px;
    height: 12px;
    background: var(--accent);
    border-radius: 50%;
    cursor: pointer;
    border: none;
}

.play-icon {
    width: 0;
    height: 0;
    border-left: 10px solid currentColor;
    border-top: 6px solid transparent;
    border-bottom: 6px solid transparent;
    transition: border-left-color var(--transition-normal);
}

.pause-icon {
    display: flex;
    gap: 3px;
    align-items: center;
}

.pause-bar {
    width: 3px;
    height: 12px;
    background-color: currentColor;
    transition: background-color var(--transition-normal);
}

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

.lang-selector {
    font-family: var(--font-body);
    font-size: 0.9rem;
    cursor: pointer;
    transition: color var(--transition-normal);
}

.lang-selector:hover {
    color: var(--accent);
}

.header-right {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    justify-self: end;
}

/* Main Title */
.main-title-section {
    position: relative;
    text-align: center;
    padding: var(--spacing-xl) var(--spacing-md) var(--spacing-sm);
}

.main-title {
    font-family: var(--font-heading);
    font-size: clamp(4rem, 15vw, 10rem);
    font-weight: 400;
    letter-spacing: -0.02em;
    line-height: 0.85;
    margin-bottom: 0;
    cursor: pointer;
    transition: color var(--transition-normal);
}

.main-title:hover {
    color: var(--accent);
}

@media (max-width: 600px) {
    .main-title {
        line-height: 0.95;
    }
}

/* Navigation Menu */
.nav-menu {
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
    align-items: flex-start;
    justify-content: center;
    gap: var(--spacing-md);
    row-gap: var(--spacing-xs);
    padding: var(--spacing-md) var(--spacing-md) 1.7rem;
}

/* Content Container */
.content-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--spacing-xs) var(--spacing-md) var(--spacing-lg);
    min-height: 60vh;
}

.content-box {
    border: 3px solid var(--text-primary);
    border-radius: 12px;
    padding: 3rem var(--spacing-lg) var(--spacing-lg);
    min-height: 400px;
}

.content-title {
    font-family: var(--font-heading);
    font-size: clamp(1.5rem, 4vw, 2.5rem);
    text-transform: uppercase;
    margin-bottom: var(--spacing-sm);
    line-height: 1;
}