/* Reset and base */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --primary: #1877f2;
    --primary-dark: #1565c0;
    --secondary: #42b72a;
    --dark: #1c1e21;
    --gray: #606770;
    --light-gray: #f0f2f5;
    --white: #ffffff;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    line-height: 1.6;
    color: var(--dark);
    background: var(--light-gray);
}

a {
    color: var(--primary);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

/* Header */
.header {
    background: var(--white);
    border-bottom: 1px solid #ddd;
    padding: 16px 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 24px;
    font-weight: 700;
    color: var(--primary);
    display: flex;
    align-items: center;
    gap: 8px;
}

.logo-check {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    background: var(--primary);
    border-radius: 6px;
}

.logo-check svg {
    width: 18px;
    height: 18px;
}

.logo-text {
    color: var(--primary); /* Blue for "YesItIs" */
}

.logo-text span {
    color: var(--secondary); /* Green for "Available" */
}

.nav {
    display: flex;
    gap: 32px;
}

.nav a {
    color: var(--gray);
    font-weight: 500;
    transition: color 0.2s;
}

.nav a:hover {
    color: var(--primary);
    text-decoration: none;
}

/* Hero */
.hero {
    background: linear-gradient(135deg, var(--primary) 0%, #4a90d9 100%);
    color: var(--white);
    padding: 80px 20px;
    text-align: center;
}

.hero h1 {
    font-size: 48px;
    margin-bottom: 16px;
    font-weight: 700;
}

.hero p {
    font-size: 20px;
    opacity: 0.9;
    max-width: 600px;
    margin: 0 auto 32px;
}

.hero-cta {
    display: inline-block;
    background: var(--secondary);
    color: var(--white);
    padding: 16px 32px;
    border-radius: 8px;
    font-size: 18px;
    font-weight: 600;
    transition: transform 0.2s, box-shadow 0.2s;
}

.hero-cta:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.2);
    text-decoration: none;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Section */
.section {
    padding: 60px 0;
}

.section-title {
    font-size: 32px;
    text-align: center;
    margin-bottom: 40px;
    color: var(--dark);
}

/* Cards grid */
.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
}

.card {
    background: var(--white);
    border-radius: 12px;
    padding: 32px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
    transition: transform 0.2s, box-shadow 0.2s;
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0,0,0,0.12);
}

.card-icon {
    font-size: 48px;
    margin-bottom: 16px;
}

.card h3 {
    font-size: 20px;
    margin-bottom: 12px;
    color: var(--dark);
}

.card p {
    color: var(--gray);
    margin-bottom: 16px;
}

.card-link {
    display: inline-block;
    color: var(--primary);
    font-weight: 600;
}

/* Tool page */
.tool-container {
    max-width: 600px;
    margin: 40px auto;
    padding: 0 20px;
}

.tool-header {
    text-align: center;
    margin-bottom: 32px;
}

.tool-header h1 {
    font-size: 32px;
    margin-bottom: 8px;
}

.tool-header p {
    color: var(--gray);
}

.tool-box {
    background: var(--white);
    border-radius: 16px;
    padding: 40px;
    box-shadow: 0 4px 16px rgba(0,0,0,0.1);
}

/* Drop zone */
.drop-zone {
    border: 3px dashed #ddd;
    border-radius: 12px;
    padding: 60px 20px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    background: var(--light-gray);
}

.drop-zone:hover, .drop-zone.dragover {
    border-color: var(--primary);
    background: #e7f3ff;
}

.drop-zone-icon {
    font-size: 48px;
    margin-bottom: 16px;
}

.drop-zone-text {
    color: var(--gray);
}

.drop-zone-text strong {
    color: var(--primary);
}

/* Progress */
.progress-container {
    display: none;
}

.file-info {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px;
    background: var(--light-gray);
    border-radius: 8px;
    margin-bottom: 16px;
}

.file-icon {
    font-size: 32px;
}

.file-name {
    flex: 1;
    font-weight: 500;
    word-break: break-all;
}

.progress-bar-container {
    background: #e0e0e0;
    border-radius: 8px;
    overflow: hidden;
    height: 12px;
}

.progress-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--primary), #63b3ed);
    width: 0%;
    transition: width 0.3s ease;
}

.progress-text {
    text-align: center;
    margin-top: 12px;
    color: var(--gray);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 14px 28px;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    border: none;
    cursor: pointer;
    transition: all 0.2s;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
}

.btn-success {
    background: var(--secondary);
    color: var(--white);
}

.btn-success:hover {
    background: #36a420;
}

.btn-secondary {
    background: var(--light-gray);
    color: var(--gray);
}

.btn-secondary:hover {
    background: #e4e6e9;
}

.btn-block {
    display: block;
    width: 100%;
    text-align: center;
}

/* Guide page */
.guide-content {
    max-width: 800px;
    margin: 40px auto;
    padding: 0 20px;
}

.guide-content h1 {
    font-size: 36px;
    margin-bottom: 24px;
}

.guide-content h2 {
    font-size: 24px;
    margin: 32px 0 16px;
    color: var(--dark);
}

.guide-content p {
    margin-bottom: 16px;
    color: var(--gray);
}

.guide-content ul, .guide-content ol {
    margin: 16px 0 16px 24px;
    color: var(--gray);
}

.guide-content li {
    margin-bottom: 8px;
}

/* Footer */
.footer {
    background: var(--dark);
    color: var(--white);
    padding: 40px 20px;
    text-align: center;
    margin-top: 60px;
}

.footer p {
    opacity: 0.7;
}

/* Responsive */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 32px;
    }

    .hero p {
        font-size: 16px;
    }

    .nav {
        gap: 16px;
    }

    .section-title {
        font-size: 24px;
    }
}