/* ==========================================================================
    HEADER MODULE - ENTERPRISE DESIGN SYSTEM
   ========================================================================== */

/* --------------------------------------------------------------------------
    1. MODULE DESIGN TOKENS
   -------------------------------------------------------------------------- */
:root {
    /* Colors & Effects */
    --header-bg: var(--bg-header, #1a1a2e);
    --header-shadow: 0 4px 20px rgba(0, 0, 0, 0.25);
    --header-border-color: var(--border-color, rgba(255, 255, 255, 0.2));
    --header-accent-color: var(--bg-hamburger-bar, #a57ae3);

    /* Geometry & Spacing */
    --header-min-height: 70px;
    --header-padding-inline: 1.5rem;
    --header-padding-block: 0.75rem;
    --header-radius-bottom: 16px;

    /* Transitions */
    --header-transition-default: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --header-transition-fast: 0.25s ease;
}

/* --------------------------------------------------------------------------
    2. MAIN HEADER CONTAINER
   -------------------------------------------------------------------------- */
.main-header {
    /* Layout & Positioning */
    position: fixed;
    inset-block-start: 0;
    inset-inline-start: 0;
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    min-block-size: var(--header-min-height);
    padding-block: var(--header-padding-block);
    padding-inline: var(--header-padding-inline);
    box-sizing: border-box;

    /* Visuals & Borders */
    background-color: var(--header-bg);
    border-end-start-radius: var(--header-radius-bottom);
    border-end-end-radius: var(--header-radius-bottom);
    box-shadow: var(--header-shadow);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);

    /* Layering & Transitions */
    z-index: 1000;
    transition: var(--header-transition-default);
}

/* --------------------------------------------------------------------------
    3. BRAND LOGO & TOGGLE ACTION (LEFT SIDE)
   -------------------------------------------------------------------------- */
.logo-toggle-btn {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 120px;
    height: 44px;
    padding: 0;
    background: transparent;
    border: none;
    outline: none;
    cursor: pointer;
}

.logo-toggle-btn:focus-visible {
    outline: 2px solid var(--header-accent-color);
    outline-offset: 4px;
    border-radius: 4px;
}

/* Brand Logo Image */
.logo-toggle-btn .logo-img {
    display: block;
    width: auto;
    height: 38px;
    object-fit: contain;
    transition: opacity var(--header-transition-fast), transform var(--header-transition-fast);
}

/* Hamburger Bars Overlay Container */
.logo-toggle-btn .hamburger-bars {
    display: none;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 5px;
    width: 44px;
    height: 44px;
    box-sizing: border-box;
    background-color: rgba(165, 122, 227, 0.15);
    border: 2px solid var(--header-accent-color);
    border-radius: 8px;
    transition: background-color var(--header-transition-fast), transform 0.2s ease;
}

.logo-toggle-btn .hamburguer-bar {
    display: block;
    width: 22px;
    height: 2px;
    background-color: var(--header-accent-color);
    border-radius: 2px;
    transition: transform 0.3s ease, opacity 0.3s ease, background-color var(--header-transition-fast);
}

/* Toggle Interaction States */
.logo-toggle-btn:hover .logo-img {
    display: none;
}

.logo-toggle-btn:hover .hamburger-bars {
    display: flex;
    transform: translateY(-1px);
}

.logo-toggle-btn:active .hamburger-bars {
    transform: translateY(0) scale(0.96);
}

/* --------------------------------------------------------------------------
    4. THEME TOGGLE ACTIONS (RIGHT SIDE)
   -------------------------------------------------------------------------- */
.header-right-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.theme-toggle-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    padding: 0;
    background-color: transparent;
    border: 2px solid var(--header-border-color);
    border-radius: 8px;
    color: var(--text-primary, #ffffff);
    outline: none;
    cursor: pointer;
    transition:
        background-color var(--header-transition-fast),
        border-color var(--header-transition-fast),
        color var(--header-transition-fast),
        transform 0.2s ease;
}

.theme-toggle-btn:hover {
    background-color: var(--btn-hover, rgba(255, 255, 255, 0.1));
    transform: translateY(-1px);
}

.theme-toggle-btn:focus-visible {
    outline: 2px solid var(--brand-primary-light, #a57ae3);
    outline-offset: 3px;
}

.theme-toggle-btn:active {
    transform: translateY(0) scale(0.96);
}

.theme-toggle-icon {
    font-size: 1.1rem;
    transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.theme-toggle-btn:hover .theme-toggle-icon {
    transform: rotate(15deg);
}

/* --------------------------------------------------------------------------
    5. RESPONSIVE BREAKPOINTS (MOBILE-FIRST & FLUID)
   -------------------------------------------------------------------------- */

/* Extra Small Mobile Devices (<= 360px) */
@media (max-width: 360px) {
    .main-header {
        padding-block: 0.5rem;
        padding-inline: 1rem;
        min-block-size: 60px;
    }

    .logo-toggle-btn {
        min-width: 90px;
        height: 40px;
    }

    .logo-toggle-btn .logo-img {
        height: 30px;
    }

    .logo-toggle-btn .hamburger-bars {
        width: 40px;
        height: 40px;
    }

    .logo-toggle-btn .hamburguer-bar {
        width: 18px;
    }

    .theme-toggle-btn {
        width: 40px;
        height: 40px;
    }
}

/* Tablet Viewports (>= 640px) */
@media (min-width: 640px) {
    .main-header {
        padding-block: 1rem;
        padding-inline: 2.5rem;
        border-end-start-radius: 24px;
        border-end-end-radius: 24px;
    }
}

/* Desktop Viewports (>= 1024px) */
@media (min-width: 1024px) {
    .main-header {
        padding-block: 1.25rem;
        padding-inline: 4rem;
    }
}

/* Ultra-Wide Viewports (>= 1440px) */
@media (min-width: 1440px) {
    .main-header {
        padding-inline: 6rem;
    }
}

/* --------------------------------------------------------------------------
    6. ACCESSIBILITY (a11y)
   -------------------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {

    .main-header,
    .logo-toggle-btn .logo-img,
    .logo-toggle-btn .hamburger-bars,
    .theme-toggle-btn,
    .theme-toggle-icon {
        transition: none;
    }

    .theme-toggle-btn:hover,
    .logo-toggle-btn:hover .hamburger-bars {
        transform: none;
    }
}