/* ===== TOOLFINITY PREMIUM DESIGN SYSTEM ===== */
:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --secondary: #8b5cf6;
    --accent: #06b6d4;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --dark: #0f172a;
    --slate: #1e293b;
    --gray: #64748b;
    --light: #f8fafc;
    --white: #ffffff;
    --gradient-primary: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #06b6d4 100%);
    --gradient-dark: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #334155 100%);
    --gradient-success: linear-gradient(135deg, #10b981 0%, #34d399 100%);
    --gradient-warning: linear-gradient(135deg, #f59e0b 0%, #fbbf24 100%);
    --shadow-sm: 0 2px 8px rgba(0,0,0,0.04), 0 1px 2px rgba(0,0,0,0.02);
    --shadow-md: 0 8px 24px rgba(0,0,0,0.06), 0 2px 6px rgba(0,0,0,0.02);
    --shadow-lg: 0 24px 48px -12px rgba(0,0,0,0.12), 0 8px 20px -8px rgba(0,0,0,0.04);
    --shadow-xl: 0 32px 64px -16px rgba(0,0,0,0.16), 0 12px 32px -12px rgba(0,0,0,0.08);
    --shadow-glow: 0 0 40px rgba(99,102,241,0.15);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 32px;
    --radius-2xl: 48px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
    background: linear-gradient(135deg, #f8fafc 0%, #eef2ff 50%, #faf5ff 100%);
    color: var(--slate);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    min-height: 100vh;
}

/* ===== PREMIUM HEADER ===== */
.header {
    background: rgba(255,255,255,0.8);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid rgba(99,102,241,0.08);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 100;
    padding: 14px 0;
}

.container {
    max-width: 1320px;
    margin: 0 auto;
    padding: 0 32px;
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    font-weight: 750;
    font-size: 1.7rem;
    color: var(--dark);
}

.logo-icon {
    font-size: 2.2rem;
    filter: drop-shadow(0 4px 6px rgba(99,102,241,0.2));
    animation: pulse-glow 3s ease-in-out infinite;
}

@keyframes pulse-glow {
    0%, 100% { filter: drop-shadow(0 4px 6px rgba(99,102,241,0.2)); }
    50% { filter: drop-shadow(0 6px 12px rgba(99,102,241,0.4)); }
}

.logo-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.nav {
    display: flex;
    gap: 36px;
}

.nav-link {
    text-decoration: none;
    font-weight: 550;
    color: var(--slate);
    font-size: 1.05rem;
    transition: var(--transition);
    position: relative;
    padding: 6px 0;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2.5px;
    background: var(--gradient-primary);
    transition: var(--transition);
    border-radius: 4px;
}

.nav-link:hover {
    color: var(--primary);
}

.nav-link:hover::after {
    width: 100%;
}

/* ===== TOOL PAGE LAYOUT ===== */
.tool-page {
    padding: 48px 0 80px;
}

.tool-container {
    max-width: 900px;
    margin: 0 auto;
    background: rgba(255,255,255,0.7);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-radius: var(--radius-2xl);
    padding: 48px;
    box-shadow: var(--shadow-lg), var(--shadow-glow);
    border: 1px solid rgba(255,255,255,0.5);
    animation: fade-in-up 0.6s ease-out;
}

@keyframes fade-in-up {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}

.tool-header {
    text-align: center;
    margin-bottom: 40px;
}

.tool-header h1 {
    font-size: 3rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
}

.tool-header p {
    font-size: 1.2rem;
    color: var(--gray);
}

/* ===== PREMIUM FORM ELEMENTS ===== */
.form-group {
    margin-bottom: 24px;
}

.form-label {
    display: block;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--slate);
    font-size: 0.95rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.form-input, .form-select, textarea.form-input {
    width: 100%;
    padding: 14px 18px;
    background: var(--white);
    border: 2px solid rgba(99,102,241,0.1);
    border-radius: var(--radius-lg);
    font-size: 1rem;
    transition: var(--transition);
    font-family: inherit;
    box-shadow: var(--shadow-sm);
}

.form-input:focus, .form-select:focus, textarea.form-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(99,102,241,0.15), var(--shadow-md);
    transform: translateY(-1px);
}

/* ===== PREMIUM UPLOAD AREA ===== */
.upload-area-tool {
    border: 3px dashed rgba(99,102,241,0.2);
    border-radius: var(--radius-xl);
    padding: 48px 24px;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    background: linear-gradient(135deg, rgba(255,255,255,0.6) 0%, rgba(249,250,251,0.8) 100%);
    backdrop-filter: blur(10px);
    margin-bottom: 24px;
}

.upload-area-tool:hover {
    border-color: var(--primary);
    background: linear-gradient(135deg, rgba(99,102,241,0.02) 0%, rgba(139,92,246,0.02) 100%);
    transform: scale(1.01);
    box-shadow: var(--shadow-md), var(--shadow-glow);
}

.upload-area-tool.dragover {
    border-color: var(--primary);
    background: rgba(99,102,241,0.05);
    transform: scale(1.02);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.upload-icon {
    font-size: 4rem;
    display: block;
    margin-bottom: 16px;
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-8px); }
}

.upload-text {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--slate);
    margin-bottom: 8px;
}

.upload-hint {
    color: var(--gray);
    font-size: 0.9rem;
}

/* ===== PREMIUM BUTTONS ===== */
.btn {
    background: var(--gradient-primary);
    color: white;
    border: none;
    padding: 16px 32px;
    border-radius: var(--radius-lg);
    font-weight: 600;
    font-size: 1.1rem;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow-md), 0 0 20px rgba(99,102,241,0.2);
    width: 100%;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left 0.6s;
}

.btn:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-xl), 0 0 40px rgba(99,102,241,0.3);
}

.btn:hover::before {
    left: 100%;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
    box-shadow: var(--shadow-sm);
}

.btn-secondary {
    background: var(--white);
    color: var(--primary);
    border: 2px solid rgba(99,102,241,0.2);
    box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
    background: rgba(99,102,241,0.05);
    border-color: var(--primary);
}

/* ===== FILE INFO CARD ===== */
.file-info {
    display: flex;
    align-items: center;
    gap: 16px;
    background: linear-gradient(135deg, rgba(255,255,255,0.9), rgba(249,250,251,0.9));
    backdrop-filter: blur(10px);
    padding: 16px 20px;
    border-radius: var(--radius-lg);
    margin-bottom: 24px;
    border: 1px solid rgba(99,102,241,0.1);
    animation: slide-in 0.3s ease-out;
}

@keyframes slide-in {
    from { opacity: 0; transform: translateX(-20px); }
    to { opacity: 1; transform: translateX(0); }
}

.file-icon {
    font-size: 2.5rem;
}

.file-details {
    flex: 1;
}

.file-name {
    font-weight: 600;
    color: var(--slate);
}

.file-size {
    font-size: 0.9rem;
    color: var(--gray);
}

/* ===== PROGRESS BAR ===== */
.progress-bar {
    height: 8px;
    background: rgba(99,102,241,0.1);
    border-radius: 20px;
    overflow: hidden;
    margin: 20px 0;
}

.progress-fill {
    height: 100%;
    background: var(--gradient-primary);
    border-radius: 20px;
    width: 0%;
    transition: width 0.3s ease;
    position: relative;
    overflow: hidden;
}

.progress-fill::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
    animation: shimmer 1.5s infinite;
}

@keyframes shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

/* ===== STATUS MESSAGE ===== */
.status-message {
    padding: 14px 20px;
    border-radius: var(--radius-lg);
    margin: 20px 0;
    font-weight: 500;
    animation: slide-in 0.3s ease-out;
}

.status-message.success {
    background: linear-gradient(135deg, rgba(16,185,129,0.1), rgba(52,211,153,0.1));
    border: 1px solid rgba(16,185,129,0.2);
    color: #047857;
}

.status-message.error {
    background: linear-gradient(135deg, rgba(239,68,68,0.1), rgba(248,113,113,0.1));
    border: 1px solid rgba(239,68,68,0.2);
    color: #b91c1c;
}

.status-message.info {
    background: linear-gradient(135deg, rgba(6,182,212,0.1), rgba(34,211,238,0.1));
    border: 1px solid rgba(6,182,212,0.2);
    color: #0891b2;
}

/* ===== DOWNLOAD SECTION ===== */
.download-section {
    background: linear-gradient(135deg, rgba(16,185,129,0.05), rgba(52,211,153,0.05));
    border-radius: var(--radius-xl);
    padding: 28px;
    margin-top: 28px;
    text-align: center;
    border: 1px solid rgba(16,185,129,0.15);
    animation: fade-in-up 0.5s ease-out;
}

.download-btn {
    display: inline-block;
    background: var(--gradient-success);
    color: white;
    padding: 16px 36px;
    border-radius: var(--radius-lg);
    text-decoration: none;
    font-weight: 600;
    font-size: 1.1rem;
    transition: var(--transition);
    box-shadow: var(--shadow-md), 0 0 20px rgba(16,185,129,0.2);
}

.download-btn:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-xl), 0 0 40px rgba(16,185,129,0.3);
}

/* ===== TOOL INFO SECTION ===== */
.tool-info {
    background: linear-gradient(135deg, rgba(255,255,255,0.6), rgba(249,250,251,0.8));
    backdrop-filter: blur(10px);
    border-radius: var(--radius-xl);
    padding: 28px;
    border: 1px solid rgba(99,102,241,0.08);
}

/* ===== PREVIEW GRID (for tools with preview) ===== */
.preview-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    margin: 28px 0;
}

.preview-box {
    text-align: center;
}

.preview-box h3 {
    margin-bottom: 16px;
    color: var(--slate);
    font-weight: 600;
}

.preview-image {
    background: repeating-conic-gradient(#f0f0f0 0% 25%, #e0e0e0 0% 50%) 50% / 20px 20px;
    border-radius: var(--radius-lg);
    padding: 24px;
    min-height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 2px dashed rgba(99,102,241,0.2);
}

.preview-image img {
    max-width: 100%;
    max-height: 300px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
}

.checkerboard-bg {
    background-image: linear-gradient(45deg, #e5e7eb 25%, transparent 25%),
        linear-gradient(-45deg, #e5e7eb 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, #e5e7eb 75%),
        linear-gradient(-45deg, transparent 75%, #e5e7eb 75%);
    background-size: 20px 20px;
    background-position: 0 0, 0 10px, 10px -10px, -10px 0px;
    background-color: #f9fafb;
}

/* ===== STATS GRID ===== */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 16px;
    margin: 28px 0;
}

.stat-card {
    background: linear-gradient(135deg, rgba(255,255,255,0.8), rgba(249,250,251,0.8));
    backdrop-filter: blur(10px);
    border-radius: var(--radius-lg);
    padding: 24px;
    text-align: center;
    border: 1px solid rgba(99,102,241,0.08);
    transition: var(--transition);
}

.stat-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
    border-color: rgba(99,102,241,0.2);
}

.stat-value {
    font-size: 2.5rem;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.stat-label {
    color: var(--gray);
    font-size: 0.9rem;
    margin-top: 4px;
}

/* ===== TOAST NOTIFICATION ===== */
.toast-container {
    position: fixed;
    bottom: 24px;
    right: 24px;
    z-index: 1000;
}

.toast {
    background: var(--white);
    padding: 16px 24px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    margin-top: 12px;
    display: flex;
    align-items: center;
    gap: 12px;
    animation: slide-in-right 0.3s ease-out;
    border-left: 4px solid var(--primary);
}

@keyframes slide-in-right {
    from { opacity: 0; transform: translateX(100px); }
    to { opacity: 1; transform: translateX(0); }
}

.toast.success { border-left-color: var(--success); }
.toast.error { border-left-color: var(--danger); }
.toast.info { border-left-color: var(--accent); }

/* ===== UTILITY CLASSES ===== */
.text-center { text-align: center; }
.mt-4 { margin-top: 16px; }
.mb-4 { margin-bottom: 16px; }
.flex { display: flex; }
.gap-4 { gap: 16px; }
.flex-wrap { flex-wrap: wrap; }

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
    .tool-container { padding: 36px; }
    .tool-header h1 { font-size: 2.5rem; }
}

@media (max-width: 768px) {
    .container { padding: 0 20px; }
    .tool-container { padding: 28px; }
    .tool-header h1 { font-size: 2rem; }
    .preview-container { grid-template-columns: 1fr; }
    .nav { gap: 20px; }
    .upload-area-tool { padding: 32px 16px; }
}

@media (max-width: 480px) {
    .header-content { flex-direction: column; gap: 12px; }
    .tool-container { padding: 20px; }
    .btn { padding: 14px 24px; font-size: 1rem; }
    .stats-grid { grid-template-columns: 1fr 1fr; }
}

/* ===== SCROLLBAR STYLING ===== */
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: rgba(99,102,241,0.05); border-radius: 10px; }
::-webkit-scrollbar-thumb { background: var(--gradient-primary); border-radius: 10px; }
::-webkit-scrollbar-thumb:hover { background: var(--primary-dark); }

/* ===== SELECTION STYLING ===== */
::selection { background: rgba(99,102,241,0.2); color: var(--dark); }