/* Modern PDF Tools - Design System */
:root {
    /* Colors */
    --color-bg: #ffffff;
    --color-bg-soft: #f8fafc;
    --color-text-main: #0f172a;
    --color-text-light: #64748b;
    --color-accent: #6366f1;
    --color-accent-hover: #4f46e5;
    --color-border: #e2e8f0;
    --color-success: #22c55e;
    --color-error: #ef4444;

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-size-base: 16px;
    --font-size-sm: 14px;
    --font-size-lg: 18px;
    --font-size-xl: 24px;
    --font-size-2xl: 36px;
    --font-size-3xl: 48px;

    /* Spacing */
    --spacing-1: 4px;
    --spacing-2: 8px;
    --spacing-3: 12px;
    --spacing-4: 16px;
    --spacing-6: 24px;
    --spacing-8: 32px;
    --spacing-12: 48px;
    --spacing-16: 64px;

    /* Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);

    /* Layout */
    --container-width: 1200px;
    --header-height: 70px;
}

[data-theme="dark"] {
    --color-bg: #0f172a;
    --color-bg-soft: #1e293b;
    --color-text-main: #f8fafc;
    --color-text-light: #94a3b8;
    --color-border: #334155;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.3);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.3), 0 2px 4px -2px rgb(0 0 0 / 0.3);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.3), 0 4px 6px -4px rgb(0 0 0 / 0.3);
}

.theme-toggle,
.bookmark-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 56px;
    height: 56px;
    border-radius: var(--radius-full);
    color: var(--color-text-main);
    background-color: var(--color-bg-soft);
    border: 1px solid var(--color-border);
    transition: all 0.2s ease;
    margin-right: var(--spacing-2);
    cursor: pointer;
    box-shadow: var(--shadow-sm);
}

.theme-toggle:hover,
.bookmark-btn:hover {
    background-color: var(--color-border);
    color: var(--color-accent);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.theme-toggle svg,
.bookmark-btn svg {
    width: 28px;
    height: 28px;
}

/* Toast Notification */
.toast-notification {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background-color: var(--color-text-main);
    color: var(--color-bg);
    padding: 12px 24px;
    border-radius: var(--radius-full);
    box-shadow: var(--shadow-lg);
    font-weight: 500;
    z-index: 1000;
    opacity: 0;
    transition: all 0.3s cubic-bezier(0.68, -0.55, 0.265, 1.55);
    display: flex;
    align-items: center;
    gap: 8px;
}

/* Confetti Animation */
.confetti {
    position: fixed;
    width: 10px;
    height: 10px;
    background-color: var(--color-accent);
    top: -10px;
    z-index: 9999;
    pointer-events: none;
    animation: confetti-fall linear forwards;
}

@keyframes confetti-fall {
    0% {
        transform: translateY(0) rotate(0deg);
        opacity: 1;
    }

    100% {
        transform: translateY(100vh) rotate(720deg);
        opacity: 0;
    }
}

/* Hide sun icon in light mode, show moon */
[data-theme="dark"] .icon-moon {
    display: none;
}

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

/* Hide moon icon in dark mode, show sun */
html:not([data-theme="dark"]) .icon-sun {
    display: none;
}

html:not([data-theme="dark"]) .icon-moon {
    display: block;
}

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

body {
    font-family: var(--font-family);
    background-color: var(--color-bg);
    color: var(--color-text-main);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

a {
    text-decoration: none;
    color: inherit;
    transition: color 0.15s ease;
}

ul {
    list-style: none;
}

button {
    font-family: inherit;
    border: none;
    background: none;
    cursor: pointer;
}

/* Layout Utilities */
.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 var(--spacing-6);
}

.section {
    padding: var(--spacing-16) 0;
}

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

.text-sm {
    font-size: var(--font-size-sm);
}

.text-light {
    color: var(--color-text-light);
}

.mt-4 {
    margin-top: var(--spacing-4);
}

.mt-8 {
    margin-top: var(--spacing-8);
}

.mb-4 {
    margin-bottom: var(--spacing-4);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-3) var(--spacing-6);
    border-radius: var(--radius-full);
    font-weight: 500;
    font-size: var(--font-size-base);
    transition: all 0.2s ease;
    white-space: nowrap;
}

.btn-primary {
    background-color: var(--color-accent);
    color: white;
}

.btn-primary:hover {
    background-color: var(--color-accent-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background-color: var(--color-bg-soft);
    color: var(--color-text-main);
}

.btn-secondary:hover {
    background-color: var(--color-border);
}

.btn-lg {
    padding: var(--spacing-4) var(--spacing-8);
    font-size: var(--font-size-lg);
}

/* Header */
.header {
    height: var(--header-height);
    display: flex;
    align-items: center;
    position: sticky;
    top: 0;
    background-color: var(--color-bg);
    opacity: 0.95;
    backdrop-filter: blur(8px);
    z-index: 50;
    border-bottom: 1px solid transparent;
    transition: border-color 0.2s;
}

.header.scrolled {
    border-color: var(--color-border);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    position: relative;
    /* For absolute centering of logo if needed */
}

.logo {
    font-weight: 800;
    font-size: 26px;
    /* Bigger text */
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    /* Center the logo on desktop */
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    text-decoration: none;
    white-space: nowrap;
    z-index: 10;
}

.logo svg {
    width: 32px;
    /* Bigger icon */
    height: 32px;
    stroke-width: 2.5;
}

.logo span {
    color: var(--color-accent);
}

/* Nav Links - Desktop Default */
.nav-links {
    display: none;
    /* Hidden on mobile by default */
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background-color: var(--color-bg);
    flex-direction: column;
    padding: var(--spacing-4) var(--spacing-6);
    gap: var(--spacing-4);
    /* Add gap for mobile items */
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-md);
}

.nav-links.active {
    display: flex;
}

@media (min-width: 768px) {
    .nav-links {
        display: flex;
        /* Always visible on desktop */
        position: static;
        flex-direction: row;
        width: auto;
        padding: 0;
        border: none;
        box-shadow: none;
        margin-left: auto;
        gap: var(--spacing-6);
    }
}

/* Mobile Menu Button */
.menu-toggle {
    display: block;
    color: var(--color-text-main);
    padding: var(--spacing-2);
}

@media (min-width: 768px) {
    .menu-toggle {
        display: none;
    }
}

.nav-link {
    font-weight: 500;
    color: var(--color-text-light);
}

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

/* Hero */
.hero {
    padding: 80px 0;
    text-align: center;
}

.hero h1 {
    font-size: var(--font-size-3xl);
    font-weight: 800;
    letter-spacing: -0.02em;
    margin-bottom: var(--spacing-2);
    /* Reduced from spacing-4 */
    line-height: 1.2;
}

.hero p {
    font-size: var(--font-size-lg);
    color: var(--color-text-light);
    max-width: 600px;
    margin: 0 auto var(--spacing-8);
}

.hero-actions {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-4);
    justify-content: center;
    margin-bottom: var(--spacing-8);
}

@media (min-width: 640px) {
    .hero-actions {
        flex-direction: row;
    }
}

.trust-badges {
    display: flex;
    justify-content: center;
    gap: var(--spacing-6);
    flex-wrap: wrap;
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
}

.trust-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
}

.icon-check {
    width: 16px;
    height: 16px;
    color: var(--color-success);
}

/* Tool Grid */
.tools-section {
    background-color: var(--color-bg-soft);
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}

.grid {
    display: grid;
    grid-template-columns: repeat(1, 1fr);
    gap: var(--spacing-6);
    margin-top: var(--spacing-8);
}

@media (min-width: 640px) {
    .grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.card {
    background: var(--color-bg);
    padding: var(--spacing-6);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    transition: all 0.2s ease;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-3);
    cursor: pointer;
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--color-accent);
}

.card-icon {
    width: 48px;
    height: 48px;
    background-color: #e0e7ff;
    /* Soft indigo background */
    border-radius: var(--radius-md);
    /* Slightly more rounded */
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-accent);
    margin-bottom: var(--spacing-3);
    transition: background-color 0.2s;
}

.card:hover .card-icon {
    background-color: var(--color-accent);
    color: white;
}

.card h3 {
    font-weight: 600;
    font-size: var(--font-size-lg);
}

.card p {
    color: var(--color-text-light);
    font-size: var(--font-size-sm);
}

/* How It Works */
.steps {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-8);
    margin-top: var(--spacing-8);
}

@media (min-width: 768px) {
    .steps {
        flex-direction: row;
        justify-content: space-between;
        text-align: center;
    }
}

.step {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-3);
}

.step-number {
    width: 32px;
    height: 32px;
    background-color: var(--color-accent);
    color: white;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    margin-bottom: var(--spacing-2);
}

/* Tool Page Specifics */
.tool-container {
    max-width: 800px;
    margin: 40px auto;
    text-align: center;
}

.upload-area {
    background-color: var(--color-bg-soft);
    border: 2px dashed var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-16) var(--spacing-6);
    margin-top: var(--spacing-8);
    transition: all 0.2s ease;
    cursor: pointer;
}

.upload-area:hover,
.upload-area.drag-over {
    border-color: var(--color-accent);
    background-color: #f1f5f9;
}

.upload-icon {
    width: 64px;
    height: 64px;
    color: var(--color-accent);
    margin-bottom: var(--spacing-4);
}

/* Footer */
.footer {
    padding: var(--spacing-12) 0;
    border-top: 1px solid var(--color-border);
    margin-top: auto;
}

.footer-content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-8);
}

@media (min-width: 768px) {
    .footer-content {
        flex-direction: row;
        justify-content: space-between;
    }
}

.footer-links {
    display: flex;
    gap: var(--spacing-6);
    flex-wrap: wrap;
}

.footer-link {
    color: var(--color-text-light);
    font-size: var(--font-size-sm);
}

.footer-link:hover {
    color: var(--color-accent);
}

/* Icons (SVG) */
svg {
    width: 24px;
    height: 24px;
    stroke: currentColor;
    stroke-width: 2;
    stroke-linecap: round;
    stroke-linejoin: round;
    fill: none;
}

/* --- Ad Containers --- */
.ad-container {
    width: 100%;
    max-width: 100%;
    margin: 60px auto 40px;
    /* Increased top margin for spacing from Trust Badges */
    text-align: center;
    overflow: hidden;
}

.ad-placeholder {
    background-color: #f1f5f9;
    border: 1px dashed #cbd5e1;
    color: #64748b;
    padding: 24px;
    font-size: 0.875rem;
    border-radius: 8px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100px;
    /* Default height */
}

.ad-placeholder span {
    font-weight: 500;
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-size: 0.75rem;
}

/* Specific Sizes */
.ad-leaderboard {
    max-width: 728px;
    height: 90px;
}


.ad-rectangle {
    max-width: 300px;
    height: 250px;
    margin: 24px auto;
}