/* ===========================
   CSS Variables - Light & Dark Mode
   =========================== */
:root {
    /* Light Mode (Default) */
    --bg-color: #F0F4F8;
    --sidebar-bg: #FFFFFF;
    --card-bg: #FFFFFF;
    --text-color: #1A202C;
    --text-secondary: #64748B;
    --border-color: #E2E8F0;

    /* Blue Accent Theme */
    --accent-color: #3B82F6;
    --accent-hover: #2563EB;
    --accent-light: rgba(59, 130, 246, 0.1);

    /* UI */
    --border-radius: 24px;
    --card-shadow: 0 10px 40px -10px rgba(0, 0, 0, 0.08);
    --font-main: 'Inter', sans-serif;
    --font-mono: 'Space Mono', monospace;

    /* Glass Effect */
    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-border: rgba(255, 255, 255, 0.5);
    --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.08);
    --glass-blur: 20px;

    /* Dot pattern */
    --dot-color: #CBD5E1;
}

/* Dark Mode */
[data-theme="dark"] {
    --bg-color: #0F172A;
    --sidebar-bg: #1E293B;
    --card-bg: #1E293B;
    --text-color: #F1F5F9;
    --text-secondary: #94A3B8;
    --border-color: #334155;

    /* Blue accent stays vibrant */
    --accent-color: #60A5FA;
    --accent-hover: #3B82F6;
    --accent-light: rgba(96, 165, 250, 0.15);

    --card-shadow: 0 10px 40px -10px rgba(0, 0, 0, 0.3);
    --glass-bg: rgba(30, 41, 59, 0.8);
    --glass-border: rgba(51, 65, 85, 0.5);
    --dot-color: #334155;
}

/* Theme Toggle Icons */
.sun-icon {
    display: none;
}

.moon-icon {
    display: block;
}

[data-theme="dark"] .sun-icon {
    display: block;
}

[data-theme="dark"] .moon-icon {
    display: none;
}

/* ===========================
   Reset & Base
   =========================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: var(--font-main);
    font-weight: 400;
    height: 100vh;
    overflow: hidden;
    line-height: 1.5;
    transition: background-color 0.3s, color 0.3s;
}

a {
    text-decoration: none;
    color: inherit;
}

/* ===========================
   Layout Container
   =========================== */
.lab-container {
    display: flex;
    height: 100vh;
    padding: 1.5rem;
    gap: 1.5rem;
    position: relative;
    transition: all 0.3s ease;
}

/* ===========================
   Sidebar
   =========================== */
.lab-sidebar {
    width: 260px;
    background-color: var(--sidebar-bg);
    border-radius: var(--border-radius);
    box-shadow: var(--card-shadow);
    display: flex;
    flex-direction: column;
    padding: 2rem;
    flex-shrink: 0;
    justify-content: space-between;
    transition: all 0.4s cubic-bezier(0.25, 1, 0.5, 1);
    opacity: 1;
    transform: translateX(0);
    margin-left: 0;
    position: relative;
    z-index: 10;
    border: 1px solid var(--border-color);
}

.lab-sidebar.hidden {
    width: 0;
    padding: 0;
    opacity: 0;
    transform: translateX(-20px);
    margin-left: -1.5rem;
    pointer-events: none;
    overflow: hidden;
    box-shadow: none;
}

.logo {
    font-weight: 700;
    font-size: 1.1rem;
    letter-spacing: -0.5px;
    margin-bottom: 3rem;
    color: var(--accent-color);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    white-space: nowrap;
}

.nav-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
    white-space: nowrap;
}

.nav-header {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-top: 1rem;
    margin-bottom: 0.2rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.nav-links li a {
    display: flex;
    align-items: center;
    padding: 0.8rem 1rem;
    border-radius: 12px;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: all 0.2s ease;
}

.nav-links li a:hover {
    background-color: var(--accent-light);
    color: var(--text-color);
}

.nav-links li a.active {
    background: var(--accent-light);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    border: 1px solid var(--accent-color);
    color: var(--accent-color);
    font-weight: 600;
}

/* ===========================
   Workspace
   =========================== */
.lab-workspace {
    flex-grow: 1;
    background-color: var(--card-bg);
    border-radius: var(--border-radius);
    box-shadow: var(--card-shadow);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    position: relative;
    transition: margin 0.4s cubic-bezier(0.25, 1, 0.5, 1);
    border: 1px solid var(--border-color);
}

/* Theme Toggle & Sidebar Toggle */
#sidebar-toggle,
#theme-toggle {
    position: absolute;
    z-index: 50;
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    cursor: pointer;
    color: var(--text-color);
    padding: 0.6rem;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

#sidebar-toggle {
    top: 1.5rem;
    left: 1.5rem;
}

#theme-toggle {
    top: 1.5rem;
    right: 1.5rem;
}

#sidebar-toggle:hover,
#theme-toggle:hover {
    background: var(--accent-light);
    border-color: var(--accent-color);
    color: var(--accent-color);
}

.workspace-content {
    flex-grow: 1;
    overflow-y: auto;
    padding: 3rem 3rem 3rem 4rem;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

/* ===========================
   Typography
   =========================== */
h1 {
    font-size: 3rem;
    font-weight: 700;
    letter-spacing: -1.5px;
    line-height: 1.1;
    color: var(--text-color);
    margin-bottom: 0.5rem;
}

.lab-subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

/* ===========================
   Grid Layout
   =========================== */
.lab-grid {
    display: grid;
    grid-template-columns: 350px 1fr;
    gap: 3rem;
    height: 100%;
    align-items: start;
}

/* ===========================
   Control Panel
   =========================== */
.control-panel {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.upload-btn {
    background: var(--accent-color);
    color: #fff;
    border: none;
    padding: 1rem 1.5rem;
    border-radius: 16px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.25s cubic-bezier(0.25, 1, 0.5, 1);
    width: 100%;
    text-align: center;
    box-shadow: 0 4px 16px rgba(59, 130, 246, 0.3);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.upload-btn:hover {
    background: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(59, 130, 246, 0.4);
}

.upload-btn:active {
    transform: translateY(0);
}

.upload-btn.secondary {
    background: var(--accent-light);
    color: var(--accent-color);
    box-shadow: none;
    border: 1px solid var(--border-color);
}

.upload-btn.secondary:hover {
    background: var(--accent-color);
    color: #fff;
}

/* ===========================
   Info Box
   =========================== */
.info-box {
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    padding: 1.5rem;
    border-radius: 20px;
    border: 1px solid var(--border-color);
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.04);
}

.info-title {
    font-size: 0.85rem;
    font-weight: 700;
    text-transform: uppercase;
    color: var(--text-secondary);
    margin-bottom: 1rem;
    letter-spacing: 0.5px;
}

.info-content {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ===========================
   Viewer Area
   =========================== */
.viewer-area {
    background: var(--card-bg);
    border-radius: 24px;
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    min-height: 500px;
    overflow: hidden;
    background-image: radial-gradient(var(--dot-color) 1.5px, transparent 1.5px);
    background-size: 24px 24px;
}

.viewer-label {
    position: absolute;
    top: 1.5rem;
    left: 1.5rem;
    font-size: 0.8rem;
    font-weight: 600;
    background: var(--glass-bg);
    padding: 0.4rem 0.8rem;
    border-radius: 8px;
    color: var(--text-secondary);
    backdrop-filter: blur(4px);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    border: 1px solid var(--border-color);
}

#result-image {
    max-width: 90%;
    max-height: 90%;
    border-radius: 12px;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.15);
}

/* ===========================
   Chat Styling
   =========================== */
#chat-history div {
    border-radius: 18px;
    border: none !important;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.05);
    padding: 1rem 1.5rem !important;
}

#user-input {
    border-radius: 40px;
    border: 1px solid var(--border-color) !important;
    padding: 1rem 1.5rem !important;
    font-family: var(--font-main) !important;
    background: var(--card-bg) !important;
    color: var(--text-color) !important;
}

input[type="text"],
textarea,
select {
    outline: none;
    color: var(--text-color) !important;
    background: var(--card-bg) !important;
    border-color: var(--border-color) !important;
}

input[type="text"]::placeholder,
textarea::placeholder {
    color: var(--text-secondary) !important;
}

input[type="text"]:focus,
textarea:focus,
select:focus {
    background: var(--card-bg) !important;
    border-color: var(--accent-color) !important;
    box-shadow: 0 0 0 4px var(--accent-light);
}

/* ===========================
   Responsive - Tablet (≤1024px)
   =========================== */
@media (max-width: 1024px) {

    /* === Layout Container === */
    .lab-container {
        padding: 0;
        gap: 0;
        flex-direction: column;
    }

    /* === Sidebar - Slide-out Drawer === */
    .lab-sidebar {
        position: fixed;
        top: 0;
        left: 0;
        width: 280px;
        height: 100vh;
        height: 100dvh;
        /* Dynamic viewport height for mobile browsers */
        border-radius: 0;
        z-index: 1000;
        transform: translateX(-100%);
        opacity: 1;
        margin-left: 0;
        padding: 2rem;
        padding-top: calc(2rem + env(safe-area-inset-top, 0px));
        padding-bottom: calc(2rem + env(safe-area-inset-bottom, 0px));
        box-shadow: 4px 0 30px rgba(0, 0, 0, 0.15);
    }

    .lab-sidebar.mobile-open {
        transform: translateX(0);
    }

    .lab-sidebar.hidden {
        width: 280px;
        padding: 2rem;
        padding-top: calc(2rem + env(safe-area-inset-top, 0px));
        opacity: 1;
        pointer-events: auto;
        overflow: visible;
        box-shadow: 4px 0 30px rgba(0, 0, 0, 0.15);
    }

    /* Sidebar Overlay */
    .sidebar-overlay {
        display: none;
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(0, 0, 0, 0.5);
        backdrop-filter: blur(4px);
        -webkit-backdrop-filter: blur(4px);
        z-index: 999;
        opacity: 0;
        transition: opacity 0.3s ease;
    }

    .sidebar-overlay.active {
        display: block;
        opacity: 1;
    }

    /* === Nav Links Touch Optimization === */
    .nav-links li a {
        padding: 1rem 1.2rem;
        font-size: 1rem;
        min-height: 48px;
        /* Touch-friendly target size */
    }

    .logo {
        font-size: 1.2rem;
        margin-bottom: 2rem;
    }

    /* === Workspace === */
    .lab-workspace {
        border-radius: 0;
        min-height: 100vh;
        min-height: 100dvh;
    }

    .workspace-content {
        padding: 4.5rem 1.5rem 2rem;
        padding-top: calc(4.5rem + env(safe-area-inset-top, 0px));
        padding-bottom: calc(2rem + env(safe-area-inset-bottom, 0px));
        padding-left: calc(1.5rem + env(safe-area-inset-left, 0px));
        padding-right: calc(1.5rem + env(safe-area-inset-right, 0px));
    }

    /* === Toggle Buttons === */
    #sidebar-toggle,
    #theme-toggle {
        padding: 0.75rem;
        border-radius: 14px;
        min-width: 44px;
        min-height: 44px;
    }

    #sidebar-toggle {
        top: 1rem;
        left: 1rem;
        left: calc(1rem + env(safe-area-inset-left, 0px));
    }

    #theme-toggle {
        top: 1rem;
        right: 1rem;
        right: calc(1rem + env(safe-area-inset-right, 0px));
    }

    /* === Grid Layout === */
    .lab-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    /* === Typography === */
    h1 {
        font-size: 2.5rem;
        letter-spacing: -1px;
    }

    .lab-subtitle {
        font-size: 1rem;
    }

    /* === Viewer Area === */
    .viewer-area {
        min-height: 350px;
        border-radius: 20px;
    }

    /* === Buttons === */
    .upload-btn {
        padding: 1.1rem 1.5rem;
        font-size: 1rem;
        min-height: 52px;
    }

    /* === Info Box === */
    .info-box {
        padding: 1.25rem;
        border-radius: 16px;
    }

    /* === Control Panel === */
    .control-panel {
        gap: 1.25rem;
    }
}

/* ===========================
   Responsive - Mobile (≤768px)
   =========================== */
@media (max-width: 768px) {
    .workspace-content {
        padding: 4rem 1rem 1.5rem;
        padding-top: calc(4rem + env(safe-area-inset-top, 0px));
        padding-bottom: calc(1.5rem + env(safe-area-inset-bottom, 0px));
    }

    h1 {
        font-size: 2rem;
        letter-spacing: -0.5px;
    }

    .lab-subtitle {
        font-size: 0.95rem;
        margin-bottom: 1.5rem;
    }

    /* === Viewer Area === */
    .viewer-area {
        min-height: 280px;
        border-radius: 16px;
    }

    .viewer-label {
        top: 1rem;
        left: 1rem;
        font-size: 0.75rem;
        padding: 0.35rem 0.7rem;
    }

    /* === Info Box === */
    .info-box {
        padding: 1rem;
    }

    .info-title {
        font-size: 0.75rem;
        margin-bottom: 0.75rem;
    }

    .info-content {
        font-size: 0.85rem;
    }

    /* === Buttons === */
    .upload-btn {
        padding: 1rem 1.25rem;
        border-radius: 14px;
    }

    .upload-btn.secondary {
        padding: 0.9rem 1.25rem;
    }

    /* === Lab Grid === */
    .lab-grid {
        gap: 1.25rem;
    }

    /* === Chat Styling === */
    #chat-history div {
        padding: 0.9rem 1.25rem !important;
        border-radius: 16px;
    }

    #user-input {
        padding: 0.9rem 1.25rem !important;
        font-size: 1rem !important;
    }
}

/* ===========================
   Responsive - Small Mobile (≤480px)
   =========================== */
@media (max-width: 480px) {
    .lab-sidebar {
        width: 100%;
        width: calc(100% - env(safe-area-inset-right, 0px));
        max-width: 320px;
    }

    .workspace-content {
        padding: 3.5rem 0.9rem 1rem;
        padding-top: calc(3.5rem + env(safe-area-inset-top, 0px));
    }

    h1 {
        font-size: 1.75rem;
    }

    .lab-subtitle {
        font-size: 0.9rem;
    }

    /* === Toggle Buttons === */
    #sidebar-toggle,
    #theme-toggle {
        top: 0.75rem;
    }

    #sidebar-toggle {
        left: 0.75rem;
        left: calc(0.75rem + env(safe-area-inset-left, 0px));
    }

    #theme-toggle {
        right: 0.75rem;
        right: calc(0.75rem + env(safe-area-inset-right, 0px));
    }

    /* === Viewer Area === */
    .viewer-area {
        min-height: 240px;
        border-radius: 14px;
        background-size: 20px 20px;
    }

    /* === Info Box === */
    .info-box {
        border-radius: 14px;
    }

    /* === Buttons === */
    .upload-btn {
        border-radius: 12px;
    }
}

/* ===========================
   Touch & Hover States
   =========================== */
@media (hover: none) and (pointer: coarse) {

    /* Remove hover effects that don't work well on touch */
    .nav-links li a:hover {
        background-color: transparent;
        color: var(--text-secondary);
    }

    .nav-links li a.active:hover {
        background: var(--accent-light);
        color: var(--accent-color);
    }

    .upload-btn:hover {
        transform: none;
    }

    .upload-btn:active {
        transform: scale(0.98);
        opacity: 0.9;
    }

    #sidebar-toggle:hover,
    #theme-toggle:hover {
        background: var(--glass-bg);
        border-color: var(--border-color);
        color: var(--text-color);
    }

    #sidebar-toggle:active,
    #theme-toggle:active {
        background: var(--accent-light);
        border-color: var(--accent-color);
        color: var(--accent-color);
    }
}

/* ===========================
   Landscape Mobile Optimization
   =========================== */
@media (max-width: 1024px) and (orientation: landscape) and (max-height: 500px) {
    .workspace-content {
        padding-top: 3.5rem;
    }

    .viewer-area {
        min-height: 200px;
    }

    h1 {
        font-size: 1.75rem;
        margin-bottom: 0.25rem;
    }

    .lab-subtitle {
        margin-bottom: 1rem;
    }

    .lab-grid {
        gap: 1rem;
    }

    .control-panel {
        gap: 1rem;
    }
}

/* ===========================
   Reduce Motion for Accessibility
   =========================== */
@media (prefers-reduced-motion: reduce) {
    .lab-sidebar {
        transition: none;
    }

    .sidebar-overlay {
        transition: none;
    }

    .upload-btn {
        transition: none;
    }

    #sidebar-toggle,
    #theme-toggle {
        transition: none;
    }
}