/* ==========================================================================
   Modern Variables & Theming
   ========================================================================== */
:root {
    --primary-bg: #f8fafc;
    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-border: rgba(255, 255, 255, 0.5);
    --text-main: #0f172a;
    --text-muted: #64748b;
    --accent-color: #4f46e5;
    --accent-hover: #4338ca;
    --gradient-brand: linear-gradient(135deg, #4f46e5 0%, #06b6d4 100%);
    --input-bg: #ffffff;
    --input-border: #cbd5e1;
    --shadow-glass: 0 8px 32px 0 rgba(31, 38, 135, 0.07);
    --radius-lg: 16px;
    --radius-md: 10px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
    --primary-bg: #0f172a;
    --glass-bg: rgba(30, 41, 59, 0.7);
    --glass-border: rgba(255, 255, 255, 0.05);
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --accent-color: #6366f1;
    --accent-hover: #4f46e5;
    --gradient-brand: linear-gradient(135deg, #6366f1 0%, #0ea5e9 100%);
    --input-bg: rgba(15, 23, 42, 0.6);
    --input-border: #334155;
    --shadow-glass: 0 8px 32px 0 rgba(0, 0, 0, 0.3);
}

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

body {
    font-family: 'Plus Jakarta Sans', sans-serif;
    background-color: var(--primary-bg);
    color: var(--text-main);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
    position: relative;
    transition: background-color 0.4s ease;
}

h1, h2, h3, .brand {
    font-family: 'Outfit', sans-serif;
}

.container {
    width: 100%;
    max-width: 850px;
    margin: 0 auto;
    padding: 0 1.5rem;
    position: relative;
    z-index: 2;
}

/* ==========================================================================
   Ambient Animated Background
   ========================================================================== */
.ambient-background {
    position: fixed;
    top: -50%; left: -50%; width: 200%; height: 200%;
    background: radial-gradient(circle at 50% 50%, rgba(79, 70, 229, 0.05) 0%, transparent 50%),
                radial-gradient(circle at 80% 20%, rgba(6, 182, 212, 0.05) 0%, transparent 40%);
    z-index: 0;
    pointer-events: none;
    animation: rotateAmbient 60s linear infinite;
}
[data-theme="dark"] .ambient-background {
    background: radial-gradient(circle at 50% 50%, rgba(99, 102, 241, 0.1) 0%, transparent 50%),
                radial-gradient(circle at 80% 20%, rgba(14, 165, 233, 0.08) 0%, transparent 40%);
}
@keyframes rotateAmbient { 100% { transform: rotate(360deg); } }

/* ==========================================================================
   Glassmorphism Utilities
   ========================================================================== */
.glass-panel {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-glass);
}

/* ==========================================================================
   Navigation
   ========================================================================== */
.navbar {
    position: sticky; top: 0; z-index: 50;
    padding: 1rem 0;
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--glass-border);
}
.nav-container { display: flex; justify-content: space-between; align-items: center; }
.brand {
    display: flex; align-items: center; gap: 0.5rem;
    font-weight: 700; font-size: 1.5rem;
    color: var(--text-main); text-decoration: none;
}
.brand-icon { color: var(--accent-color); }
.nav-links { display: flex; align-items: center; gap: 1.5rem; }
.nav-links a {
    text-decoration: none; color: var(--text-muted); font-weight: 600;
    transition: var(--transition);
}
.nav-links a:hover, .nav-links a.active { color: var(--accent-color); }
.theme-btn {
    background: none; border: none; color: var(--text-main);
    cursor: pointer; display: flex; align-items: center;
    padding: 0.5rem; border-radius: 50%; background: var(--input-bg);
    box-shadow: var(--shadow-glass); border: 1px solid var(--glass-border);
    transition: var(--transition);
}
.theme-btn:hover { transform: scale(1.1); color: var(--accent-color); }

/* ==========================================================================
   Hero Section
   ========================================================================== */
.page-header { text-align: center; margin: 4rem 0 3rem; }
.gradient-text {
    background: var(--gradient-brand);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    font-size: 3.5rem; font-weight: 700; line-height: 1.2;
    margin-bottom: 1rem; letter-spacing: -1px;
}
.page-header p {
    color: var(--text-muted); font-size: 1.25rem; max-width: 600px; margin: 0 auto;
}

/* ==========================================================================
   Tool Section (Inputs, Uploads)
   ========================================================================== */
.tool-section { padding: 2.5rem; margin-bottom: 4rem; }
.input-group { margin-bottom: 1.5rem; display: flex; flex-direction: column; gap: 0.5rem; }
.input-group label {
    font-weight: 600; display: flex; align-items: center; gap: 0.5rem;
    color: var(--text-main); font-size: 0.95rem;
}
.input-group label i { width: 18px; height: 18px; color: var(--accent-color); }

/* Custom File Upload Styling */
.file-upload-wrapper { position: relative; width: 100%; height: 120px; }
.file-upload-wrapper input[type="file"] {
    position: absolute; width: 100%; height: 100%; opacity: 0; cursor: pointer; z-index: 2;
}
.file-upload-visual {
    position: absolute; top: 0; left: 0; width: 100%; height: 100%;
    border: 2px dashed var(--input-border); border-radius: var(--radius-md);
    display: flex; flex-direction: column; justify-content: center; align-items: center;
    background: var(--input-bg); color: var(--text-muted); transition: var(--transition);
    z-index: 1; gap: 0.5rem; font-weight: 500;
}
.file-upload-wrapper:hover .file-upload-visual {
    border-color: var(--accent-color); background: rgba(99, 102, 241, 0.05); color: var(--accent-color);
}

textarea, input[type="password"] {
    width: 100%; padding: 1rem; border-radius: var(--radius-md);
    background: var(--input-bg); border: 1px solid var(--input-border);
    color: var(--text-main); font-family: 'Plus Jakarta Sans', sans-serif;
    font-size: 1rem; transition: var(--transition); outline: none;
}
textarea:focus, input[type="password"]:focus {
    border-color: var(--accent-color); box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.1);
}

.image-preview-container {
    width: 100%; max-height: 400px; border-radius: var(--radius-md); margin-bottom: 1.5rem;
    display: none; background: #000; justify-content: center; align-items: center;
    overflow: hidden; border: 1px solid var(--glass-border);
}
canvas { max-width: 100%; max-height: 400px; object-fit: contain; }

.capacity-indicator { font-size: 0.85rem; color: var(--text-muted); text-align: right; font-weight: 600;}

/* Glow Button */
.btn-primary {
    display: flex; align-items: center; justify-content: center; gap: 0.75rem;
    width: 100%; padding: 1rem 1.5rem; font-size: 1.1rem; font-weight: 600; font-family: 'Outfit', sans-serif;
    color: white; background: var(--gradient-brand); border: none; border-radius: var(--radius-md);
    cursor: pointer; transition: var(--transition); margin-top: 1rem; position: relative; overflow: hidden;
}
.btn-primary:hover:not(:disabled) { transform: translateY(-2px); box-shadow: 0 10px 20px -10px var(--accent-color); }
.btn-primary:disabled { background: var(--input-border); color: var(--text-muted); cursor: not-allowed; }

/* Alert Box */
.alert-box {
    display: flex; align-items: flex-start; gap: 1rem; padding: 1rem; border-radius: var(--radius-md);
    margin-bottom: 1.5rem; position: relative;
}
.warning-alert { background: rgba(245, 158, 11, 0.1); border: 1px solid rgba(245, 158, 11, 0.3); color: #b45309; }
[data-theme="dark"] .warning-alert { color: #fcd34d; }
.alert-icon { margin-top: 2px; }
.alert-content strong { display: block; font-size: 0.95rem; margin-bottom: 0.25rem; font-family: 'Outfit', sans-serif;}
.alert-content p { font-size: 0.875rem; }
.alert-close { position: absolute; top: 1rem; right: 1rem; background: none; border: none; color: inherit; cursor: pointer; }

/* ==========================================================================
   SEO Content & Developer Grid
   ========================================================================== */
.section-title { text-align: center; font-size: 2rem; margin-bottom: 2rem; color: var(--text-main); }
.content-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 1.5rem; margin-bottom: 4rem; }
.content-card { padding: 2rem; border-radius: var(--radius-lg); text-align: left; transition: transform 0.3s ease;}
.content-card:hover { transform: translateY(-5px); }
.card-icon-wrapper {
    width: 50px; height: 50px; border-radius: 12px; background: rgba(99, 102, 241, 0.1);
    display: flex; justify-content: center; align-items: center; margin-bottom: 1.25rem; color: var(--accent-color);
}
.content-card h3 { font-size: 1.25rem; margin-bottom: 0.75rem; }
.content-card p { color: var(--text-muted); font-size: 0.95rem; }

.developer-profile { text-align: center; padding: 3rem 2rem; margin-bottom: 4rem; }
.dev-avatar { width: 80px; height: 80px; border-radius: 50%; margin-bottom: 1rem; border: 3px solid var(--accent-color); padding: 3px;}
.developer-profile h2 { font-size: 1.5rem; margin-bottom: 0.5rem; }
.developer-profile p { color: var(--text-muted); max-width: 600px; margin: 0 auto 1.5rem; }
.dev-links { display: flex; justify-content: center; flex-wrap: wrap; gap: 1rem; }
.dev-links a {
    display: flex; align-items: center; gap: 0.5rem; padding: 0.6rem 1.2rem; border-radius: 30px;
    background: var(--input-bg); border: 1px solid var(--input-border); color: var(--text-main);
    text-decoration: none; font-weight: 600; font-size: 0.9rem; transition: var(--transition);
}
.dev-links a i { width: 16px; height: 16px; }
.dev-links a:hover { background: var(--gradient-brand); color: white; border-color: transparent; }

.site-footer { text-align: center; padding: 2rem 0; border-top: 1px solid var(--glass-border); color: var(--text-muted); font-size: 0.9rem; margin-top: auto;}

/* Media Queries */
@media (max-width: 640px) {
    .gradient-text { font-size: 2.5rem; }
    .tool-section { padding: 1.5rem; }
}