/* ==================== RESET & BASE ==================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --color-bg-primary: rgba(25, 25, 40, 0.95);
    --color-bg-secondary: rgba(40, 35, 50, 0.92);
    --color-bg-tertiary: rgba(30, 40, 45, 0.90);

    --color-text-primary: #c9d1d9;
    --color-text-secondary: #b8c5d3;
    --color-text-muted: #8b98a5;

    --color-accent-primary: rgba(120, 150, 180, 0.6);
    --color-accent-secondary: rgba(100, 150, 180, 0.4);
    --color-accent-glow: rgba(100, 150, 180, 0.2);

    --color-border: rgba(100, 120, 140, 0.3);
    --color-border-accent: rgba(120, 150, 180, 0.5);

    --sidebar-width: 80px;
    --header-height: 70px;

    --font-main: 'Trebuchet MS', 'Lucida Sans Unicode', sans-serif;
    --font-heading: 'Georgia', serif;
}

body {
    font-family: var(--font-main);
    background: url('images/myranosia.webp') no-repeat center center fixed;
    background-size: cover;
    color: var(--color-text-primary);
    overflow-x: hidden;
}

/* ==================== HEADER ==================== */
.site-header {
    position: fixed;
    top: 0;
    left: var(--sidebar-width);
    right: 0;
    height: var(--header-height);
    background: linear-gradient(135deg,
        var(--color-bg-primary),
        var(--color-bg-secondary));
    border-bottom: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    padding: 0 2rem;
    z-index: 900;
    backdrop-filter: blur(10px);
}

.site-title {
    font-family: var(--font-heading);
    font-size: 1.8rem;
    color: var(--color-text-primary);
    font-weight: 400;
    letter-spacing: 0.1em;
}

.site-subtitle {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    font-style: italic;
    margin-left: 1.5rem;
    letter-spacing: 0.05em;
}

/* ==================== SIDEBAR NAVIGATION ==================== */
.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: var(--sidebar-width);
    height: 100vh;
    background: linear-gradient(180deg,
        var(--color-bg-primary),
        var(--color-bg-tertiary));
    border-right: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 1.5rem 0;
    z-index: 1000;
    backdrop-filter: blur(10px);
}

.nav-icon {
    width: 50px;
    height: 50px;
    margin: 0.5rem 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg,
        rgba(60, 80, 100, 0.3),
        rgba(40, 50, 65, 0.4));
    border: 1px solid var(--color-border);
    border-radius: 8px;
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: 1.5rem;
    transition: all 0.3s ease;
    cursor: pointer;
    position: relative;
}

.nav-icon:hover {
    background: linear-gradient(135deg,
        rgba(80, 110, 140, 0.5),
        rgba(60, 70, 85, 0.6));
    border-color: var(--color-border-accent);
    color: var(--color-text-primary);
    box-shadow: 0 4px 20px var(--color-accent-glow);
    transform: translateX(5px);
}

.nav-icon::after {
    content: attr(data-tooltip);
    position: absolute;
    left: 70px;
    background: var(--color-bg-primary);
    color: var(--color-text-primary);
    padding: 0.5rem 1rem;
    border-radius: 4px;
    border: 1px solid var(--color-border-accent);
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
    font-size: 0.85rem;
    letter-spacing: 0.05em;
}

.nav-icon:hover::after {
    opacity: 1;
}

.nav-icon.active {
    background: linear-gradient(135deg,
        rgba(100, 130, 160, 0.5),
        rgba(80, 90, 105, 0.6));
    border-left: 3px solid var(--color-border-accent);
    color: #e6edf3;
}

/* ==================== MAIN CONTENT ==================== */
.main-content {
    margin-left: var(--sidebar-width);
    margin-top: var(--header-height);
    min-height: calc(100vh - var(--header-height));
}

/* ==================== HERO SECTION ==================== */
.hero {
    height: calc(100vh - var(--header-height));
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    background: linear-gradient(135deg,
        rgba(25, 25, 40, 0.75),
        rgba(40, 35, 50, 0.70),
        rgba(30, 40, 45, 0.72));
    padding: 3rem;
}

.hero-title {
    font-size: 5rem;
    margin-bottom: 1rem;
    color: var(--color-text-primary);
    text-shadow: 0 0 15px var(--color-accent-secondary),
                 2px 2px 6px rgba(0, 0, 0, 0.9);
    font-weight: 400;
    letter-spacing: 0.2em;
    font-family: var(--font-heading);
}

.hero-subtitle {
    font-size: 1.5rem;
    margin-bottom: 3rem;
    color: var(--color-text-secondary);
    text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.8);
    font-style: italic;
    letter-spacing: 0.05em;
}

/* ==================== NAVIGATION GRID ==================== */
.nav-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 2rem;
    max-width: 1000px;
    width: 100%;
    padding: 2rem;
}

.nav-card {
    background: linear-gradient(135deg,
        rgba(50, 50, 65, 0.5),
        rgba(35, 40, 50, 0.6));
    border: 1px solid var(--color-border);
    border-left: 3px solid var(--color-border-accent);
    border-radius: 12px;
    padding: 2.5rem 1.5rem;
    text-align: center;
    text-decoration: none;
    color: var(--color-text-primary);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
    backdrop-filter: blur(8px);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.nav-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 48px rgba(0, 0, 0, 0.6),
                8px 0 30px var(--color-accent-glow),
                inset -2px 0 10px var(--color-accent-glow);
    border-left-color: rgba(150, 180, 200, 0.8);
    background: linear-gradient(135deg,
        rgba(55, 55, 70, 0.6),
        rgba(40, 45, 55, 0.7));
}

.nav-card-icon {
    font-size: 3rem;
    margin-bottom: 0.5rem;
}

.nav-card-title {
    font-size: 1.4rem;
    font-weight: 500;
    letter-spacing: 0.05em;
    color: var(--color-text-primary);
    text-shadow: 0 0 8px var(--color-accent-secondary),
                 1px 1px 3px rgba(0, 0, 0, 0.8);
}

.nav-card-description {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    line-height: 1.5;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.8);
}

/* ==================== UTILITY CLASSES ==================== */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 2rem;
}

/* ==================== RESPONSIVE ==================== */
@media (max-width: 768px) {
    :root {
        --sidebar-width: 0px;
    }

    .sidebar {
        display: none;
    }

    .site-header {
        left: 0;
        flex-direction: column;
        height: auto;
        padding: 1rem;
        text-align: center;
    }

    .site-subtitle {
        margin-left: 0;
        margin-top: 0.5rem;
    }

    .main-content {
        margin-left: 0;
        margin-top: 0;
    }

    .hero-title {
        font-size: 3rem;
    }

    .nav-grid {
        grid-template-columns: 1fr;
    }
}