/**
 * RoundCut - Navigation System
 * Desktop dropdown + Mobile hamburger menu
 * Version: 1.0.0
 */

/* ===================================
   HEADER - BASE STYLES
   =================================== */

.header {
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    padding: 16px 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
}

.logo {
    display: flex;
    align-items: center;
    text-decoration: none;
    flex-shrink: 0;
}

.logo img {
    height: 60px;
    width: auto;
    max-width: 100%;
    object-fit: contain;
    transition: opacity 0.3s ease;
}

.logo:hover img {
    opacity: 0.85;
}

/* ===================================
   DESKTOP NAVIGATION (> 991px)
   =================================== */

.nav-desktop {
    display: flex;
    gap: 24px;
    align-items: center;
    margin-left: auto;
    margin-right: 20px;
}

/* Tools Dropdown */
.tools-dropdown {
    position: relative;
}

.tools-dropdown-btn {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 8px 16px;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 500;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    transition: border-color 0.2s ease, color 0.2s ease;
    white-space: nowrap;
    width: 145px;
    justify-content: center;
}

.tools-dropdown-btn:hover {
    border-color: #9B59B6;
    color: #9B59B6;
}

.tools-dropdown-btn:focus {
    outline: 2px solid #9B59B6;
    outline-offset: 2px;
}

.dropdown-icon {
    width: 12px;
    height: 12px;
    transition: transform 0.2s ease;
    fill: currentColor;
}

.tools-dropdown.open .dropdown-icon {
    transform: rotate(180deg);
}

/* Dropdown Menu */
.tools-dropdown-menu {
    position: absolute;
    top: calc(100% + 8px);
    left: 50%;
    transform: translateX(-50%) translateY(-10px);
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
    min-width: 200px;
    display: none;
    opacity: 0;
    transition: opacity 0.2s ease, transform 0.2s ease;
    z-index: 100;
    overflow: hidden;
}

.tools-dropdown.open .tools-dropdown-menu {
    display: block;
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

.dropdown-section {
    padding: 12px 0;
}

.dropdown-section:not(:last-child) {
    border-bottom: 1px solid var(--border-color);
}

.dropdown-header {
    padding: 8px 16px;
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    color: var(--text-muted);
    letter-spacing: 0.5px;
}

.dropdown-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 16px;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    transition: all 0.15s ease;
}

.dropdown-item:hover {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

.dropdown-item:focus {
    background: var(--bg-secondary);
    color: var(--text-primary);
    outline: 2px solid #9B59B6;
    outline-offset: -2px;
}

.dropdown-item.active {
    background: #9B59B6;
    color: white;
}

.dropdown-item.active:hover {
    background: #8E44AD;
}

.dropdown-divider {
    height: 1px;
    background: var(--border-color);
    margin: 8px 16px;
}

/* Hamburger - Hidden on desktop */
.hamburger-btn {
    display: none;
}

/* Mobile Menu - Hidden on desktop */
.mobile-menu {
    display: none;
}

/* ===================================
   MOBILE NAVIGATION (≤ 991px)
   =================================== */

@media (max-width: 991px) {
    /* Hide desktop nav */
    .nav-desktop {
        display: none;
    }

    /* Reorganize header layout for mobile */
    .header-content {
        position: relative;
    }

    /* Hamburger button - LEFT side */
    .hamburger-btn {
        display: flex;
        flex-direction: column;
        gap: 5px;
        background: transparent;
        border: none;
        padding: 8px;
        cursor: pointer;
        order: -1;
        margin-right: auto;
        margin-left: 0;
        z-index: 2001;
        position: relative;
    }

    /* Logo - CENTER and 20% larger */
    .logo {
        position: absolute;
        left: 50%;
        transform: translateX(-50%);
    }

    .logo img {
        height: 72px !important; /* 60px + 20% = 72px */
    }

    /* Nav menu - RIGHT side */
    .nav-menu {
        margin-left: auto;
    }

    /* Hide theme toggle from header on mobile */
    .theme-toggle {
        display: none !important;
    }

    .hamburger-line {
        width: 24px;
        height: 2px;
        background: var(--text-primary);
        border-radius: 2px;
        transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }

    /* Hamburger animation when open */
    .hamburger-btn.active .hamburger-line:nth-child(1) {
        transform: rotate(45deg) translate(6px, 6px);
    }

    .hamburger-btn.active .hamburger-line:nth-child(2) {
        opacity: 0;
    }

    .hamburger-btn.active .hamburger-line:nth-child(3) {
        transform: rotate(-45deg) translate(6px, -6px);
    }

    /* Mobile Menu Overlay - Premium Sidebar (2/3 width) */
    .mobile-menu {
        display: flex;
        flex-direction: column;
        position: fixed;
        top: 0;
        left: 0;
        width: 66.67%; /* 2/3 of screen */
        max-width: 380px;
        height: 100vh;
        background: var(--bg-primary);
        z-index: 2000;
        transform: translateX(-100%);
        transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
        overflow-y: auto;
        -webkit-overflow-scrolling: touch;
        border-top-right-radius: 24px;
        border-bottom-right-radius: 24px;
        box-shadow: 4px 0 24px rgba(0, 0, 0, 0.15);
    }

    [data-theme="dark"] .mobile-menu {
        box-shadow: 4px 0 32px rgba(0, 0, 0, 0.4);
        border-right: 1px solid rgba(255, 255, 255, 0.1);
    }

    .mobile-menu.active {
        transform: translateX(0);
    }

    /* Backdrop overlay - darkens remaining 1/3 of screen */
    .mobile-menu-backdrop {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100vh;
        background: rgba(0, 0, 0, 0.5);
        opacity: 0;
        pointer-events: none;
        transition: opacity 0.35s cubic-bezier(0.4, 0, 0.2, 1);
        backdrop-filter: blur(3px);
        -webkit-backdrop-filter: blur(3px);
        z-index: 1999;
    }

    .mobile-menu-backdrop.active {
        opacity: 1;
        pointer-events: auto;
    }

    [data-theme="dark"] .mobile-menu-backdrop {
        background: rgba(0, 0, 0, 0.7);
    }

    .mobile-menu-header {
        display: flex;
        justify-content: space-between;
        align-items: center;
        padding: 20px 24px;
        border-bottom: 1px solid var(--border-color);
        flex-shrink: 0;
    }

    .mobile-menu-logo {
        font-size: 20px;
        font-weight: 700;
        color: var(--text-primary);
        letter-spacing: -0.5px;
    }

    .mobile-menu-close {
        background: transparent;
        border: none;
        font-size: 28px;
        color: var(--text-secondary);
        cursor: pointer;
        padding: 8px;
        line-height: 1;
        transition: color 0.2s ease;
        display: flex;
        align-items: center;
        justify-content: center;
    }

    .mobile-menu-close:hover {
        color: var(--text-primary);
    }

    .mobile-menu-nav {
        flex: 1;
        padding: 24px 0;
        overflow-y: auto;
    }

    .mobile-menu-item {
        display: flex;
        align-items: center;
        gap: 12px;
        padding: 16px 24px;
        color: var(--text-secondary);
        text-decoration: none;
        font-size: 16px;
        font-weight: 500;
        transition: all 0.2s ease;
        border-left: 3px solid transparent;
    }

    .mobile-menu-item:hover {
        background: var(--bg-secondary);
        color: var(--text-primary);
        border-left-color: #9B59B6;
    }

    .mobile-menu-item:focus {
        background: var(--bg-secondary);
        color: var(--text-primary);
        border-left-color: #9B59B6;
        outline: none;
    }

    .mobile-menu-item.active {
        background: var(--bg-secondary);
        color: #9B59B6;
        border-left-color: #9B59B6;
    }

    .mobile-menu-footer {
        padding: 20px 24px;
        border-top: 1px solid var(--border-color);
        display: flex;
        flex-direction: column;
        gap: 12px;
        flex-shrink: 0;
    }

    .mobile-settings-btn {
        background: var(--bg-secondary);
        border: 1px solid var(--border-color);
        padding: 12px 16px;
        border-radius: 8px;
        font-size: 14px;
        font-weight: 500;
        color: var(--text-primary);
        cursor: pointer;
        transition: all 0.2s ease;
        display: flex;
        align-items: center;
        gap: 12px;
        width: 100%;
        text-align: left;
    }

    .mobile-settings-btn svg {
        color: var(--text-secondary);
        transition: color 0.2s ease;
    }

    .mobile-settings-btn:hover {
        background: var(--bg-card);
        border-color: #9B59B6;
    }

    .mobile-settings-btn:hover svg {
        color: #9B59B6;
    }

    .mobile-settings-btn:focus {
        background: var(--bg-card);
        border-color: #9B59B6;
        outline: 2px solid #9B59B6;
        outline-offset: 2px;
    }

    .mobile-settings-btn:focus svg {
        color: #9B59B6;
    }

    /* Prevent body scroll when menu is open */
    body.menu-open {
        overflow: hidden;
        position: fixed;
        width: 100%;
        height: 100%;
    }
}

/* ===================================
   TABLET ADJUSTMENTS (≤ 768px)
   =================================== */

@media (max-width: 768px) {
    .header-content {
        padding: 0 16px;
    }

    /* Logo centered - 20% larger than 45px base = 54px */
    .logo img {
        height: 54px !important;
    }

    /* Sidebar slightly wider on tablet */
    .mobile-menu {
        width: 70%;
        max-width: 340px;
    }

    .mobile-menu-header {
        padding: 16px 20px;
    }

    .mobile-menu-item {
        padding: 14px 20px;
        font-size: 15px;
    }

    .mobile-menu-footer {
        padding: 16px 20px;
    }
}

/* ===================================
   SMALL MOBILE (≤ 480px)
   =================================== */

@media (max-width: 480px) {
    .header {
        padding: 12px 0;
    }

    .header-content {
        padding: 0 12px;
    }

    /* Logo centered - 20% larger than 38px base = 45.6px */
    .logo img {
        height: 46px !important;
    }

    /* Sidebar takes more space on small phones */
    .mobile-menu {
        width: 75%;
        max-width: 300px;
        border-top-right-radius: 20px;
        border-bottom-right-radius: 20px;
    }

    .hamburger-btn {
        gap: 4px;
        padding: 6px;
    }

    .hamburger-line {
        width: 22px;
        height: 2px;
    }

    .mobile-menu-header {
        padding: 14px 16px;
    }

    .mobile-menu-logo {
        font-size: 18px;
    }

    .mobile-menu-close {
        font-size: 24px;
    }

    .mobile-menu-nav {
        padding: 16px 0;
    }

    .mobile-menu-item {
        padding: 12px 16px;
        font-size: 14px;
        gap: 10px;
    }

    .mobile-menu-footer {
        padding: 14px 16px;
        gap: 10px;
    }

    .mobile-settings-btn {
        padding: 10px 14px;
        font-size: 13px;
    }
}

/* ===================================
   EXTRA SMALL (≤ 320px)
   =================================== */

@media (max-width: 320px) {
    /* Logo centered - 20% larger than 32px base = 38.4px */
    .logo img {
        height: 38px !important;
    }

    /* Sidebar wider on very small screens */
    .mobile-menu {
        width: 80%;
        max-width: 280px;
    }

    .mobile-menu-item {
        padding: 10px 12px;
        font-size: 13px;
    }
}

/* ===================================
   DARK MODE SUPPORT
   =================================== */

[data-theme="dark"] .tools-dropdown-menu {
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
}

[data-theme="dark"] .mobile-menu {
    box-shadow: 2px 0 8px rgba(0, 0, 0, 0.3);
}

/* ===================================
   ACCESSIBILITY
   =================================== */

/* Focus visible for keyboard navigation */
.tools-dropdown-btn:focus-visible,
.dropdown-item:focus-visible,
.hamburger-btn:focus-visible,
.mobile-menu-close:focus-visible,
.mobile-menu-item:focus-visible,
.mobile-settings-btn:focus-visible {
    outline: 2px solid #9B59B6;
    outline-offset: 2px;
}

/* Reduce motion for users who prefer it */
@media (prefers-reduced-motion: reduce) {
    .tools-dropdown-menu,
    .mobile-menu,
    .hamburger-line,
    .dropdown-icon {
        transition: none;
    }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    .tools-dropdown-btn {
        border-width: 2px;
    }

    .mobile-menu-item {
        border-left-width: 4px;
    }
}