/* =========================================
   1. BASE STYLES & VARIABLES
========================================= */
:root {
    --bg-color: #f8fafc;
    --text-main: #0f172a;
    --text-sub: #64748b;
    --border-color: #e2e8f0;
    --primary: #ef4444;
}

[data-theme='dark'] {
    --bg-color: #0f172a;
    --text-main: #f8fafc;
    --text-sub: #94a3b8;
    --border-color: #334155;
}

* {
    box-sizing: border-box;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

body {
    margin: 0;
    background-color: var(--bg-color);
    color: var(--text-main);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* =========================================
   2. NAVBAR STYLES
========================================= */
.navbar-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 40px;
    background-color: var(--bg-color);
    border-bottom: 1px solid var(--border-color);
}

.navbar-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: var(--text-main);
    font-size: 22px;
}

.logo-icon {
    background: var(--primary);
    color: white;
    padding: 8px;
    border-radius: 8px;
    display: flex;
}

.navbar-links {
    display: flex;
    gap: 25px;
    align-items: center;
}

.navbar-links a {
    text-decoration: none;
    color: var(--text-sub);
    font-weight: 600;
    font-size: 15px;
    transition: color 0.2s;
}

.navbar-links a:hover, .navbar-links a.active {
    color: var(--primary);
}

/* =========================================
   3. HOMEPAGE GRID & CARDS
========================================= */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.grid-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 25px;
    margin-bottom: 60px;
}

.tool-card {
    background: white;
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 30px 20px;
    text-align: center;
    text-decoration: none;
    color: var(--text-main);
    transition: all 0.3s ease;
    box-shadow: 0 4px 6px rgba(0,0,0,0.02);
}

[data-theme='dark'] .tool-card {
    background: #1e293b;
}

.tool-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 20px rgba(0,0,0,0.08);
    border-color: var(--primary);
}

.tool-icon {
    width: 64px;
    height: 64px;
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px auto;
}

.tool-card h3 {
    margin: 0 0 10px 0;
    font-size: 18px;
}

.tool-card p {
    margin: 0;
    color: var(--text-sub);
    font-size: 14px;
    line-height: 1.5;
}

/* =========================================
   4. PREMIUM SPLIT-SCREEN LAYOUT (For Tools)
========================================= */
.premium-layout {
    display: flex;
    min-height: calc(100vh - 75px);
    background-color: #f3f4f6; 
    margin: 0;
}

[data-theme='dark'] .premium-layout { background-color: #0f172a; }

.workspace {
    flex: 1;
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 40px;
    overflow-y: auto;
}

.sidebar {
    width: 380px;
    background-color: #ffffff;
    border-left: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    box-shadow: -4px 0 15px rgba(0,0,0,0.03);
}

[data-theme='dark'] .sidebar { background-color: #1e293b; }

.sidebar-header {
    padding: 20px 25px;
    border-bottom: 1px solid var(--border-color);
    text-align: center;
    font-size: 22px;
    font-weight: 700;
    color: #1f2937;
}

.sidebar-content {
    padding: 25px;
    flex: 1;
    overflow-y: auto;
}

.info-box {
    padding: 15px;
    border-radius: 8px;
    font-size: 13px;
    display: flex;
    gap: 10px;
    margin-bottom: 25px;
    line-height: 1.5;
}

.sidebar-footer {
    padding: 20px 25px;
    border-top: 1px solid var(--border-color);
    background: #ffffff;
}

[data-theme='dark'] .sidebar-footer { background: #1e293b; }

.btn-premium-action {
    color: white;
    width: 100%;
    padding: 18px;
    border: none;
    border-radius: 8px;
    font-size: 18px;
    font-weight: 700;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    transition: opacity 0.2s;
    font-family: inherit;
}
.btn-premium-action:hover { opacity: 0.9; }

/* Upload Area & File Thumbnail */
.upload-area-premium {
    background: white;
    border: 2px dashed #cbd5e1;
    border-radius: 12px;
    width: 100%;
    max-width: 500px;
    padding: 60px 40px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s;
}

[data-theme='dark'] .upload-area-premium { background: #1e293b; border-color: #475569; }

.upload-area-premium:hover { border-color: var(--primary); transform: scale(1.02); }

.file-thumbnail-card {
    background: white;
    padding: 15px;
    border-radius: 8px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.08);
    display: none;
    flex-direction: column;
    align-items: center;
    width: 200px;
}

[data-theme='dark'] .file-thumbnail-card { background: #1e293b; }

.file-name-display { font-size: 12px; color: var(--text-sub); word-break: break-all; text-align: center; font-weight: 600; }

.add-more-btn {
    position: absolute;
    top: 30px;
    right: 30px;
    color: white;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: none;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    cursor: pointer;
    box-shadow: 0 4px 10px rgba(0,0,0,0.2);
    border: none;
    transition: transform 0.2s;
}
.add-more-btn:hover { transform: scale(1.1); }