/* ---------------------------------------------------- */
/* 1. Global & Reset (Smallpdf-Inspired Light Theme)    */
/* ---------------------------------------------------- */

:root {
    /* Color Palette */
    --color-primary: #0d6efd; /* A friendly, standard blue */
    --color-primary-dark: #0b5ed7;
    --color-background: #f8f9fa; /* Very light grey background */
    --color-surface: #ffffff; /* Pure white for cards */
    --color-text-dark: #212529; /* Dark, readable text */
    --color-text-muted: #6c757d;
    --color-border: #dee2e6;
    
    /* Spacing */
    --spacing-lg: 3rem;
    --spacing-md: 1.5rem;
    --spacing-sm: 0.75rem;
}

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

body {
    font-family: 'Montserrat', sans-serif;
    background-color: var(--color-background);
    color: var(--color-text-dark);
    line-height: 1.6;
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-md) 0;
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color 0.3s ease;
}

a:hover {
    color: var(--color-primary-dark);
}

/* ---------------------------------------------------- */
/* 2. Header & Footer (Clean & Simple)                  */
/* ---------------------------------------------------- */

header {
    background-color: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    padding: var(--spacing-sm) 0;
}

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

.logo, .logo a {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--color-primary);
    text-decoration: none;
}

footer {
    background-color: var(--color-surface);
    color: var(--color-text-muted);
    font-size: 0.9rem;
    padding: var(--spacing-lg) 0;
    text-align: center;
    border-top: 1px solid var(--color-border);
    margin-top: var(--spacing-lg);
}

footer p {
    margin: 0.5rem 0;
}
footer a {
    color: var(--color-text-muted);
    font-weight: 600;
}

/* ---------------------------------------------------- */
/* 3. Hero Section (Spacious & Focused)                 */
/* ---------------------------------------------------- */

.hero-section {
    padding: 5rem 0;
    text-align: center;
    background-color: var(--color-surface);
    margin-bottom: var(--spacing-lg);
}

.hero-tagline {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-dark);
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--color-text-muted);
    max-width: 600px;
    margin: 0 auto var(--spacing-lg);
}

/* ---------------------------------------------------- */
/* 4. CTA Button (Friendly & Rounded)                   */
/* ---------------------------------------------------- */

.cta-button {
    display: inline-block;
    padding: 0.8rem 2.5rem;
    border: 1px solid var(--color-primary);
    border-radius: 8px; /* Softer, rounded corners */
    background-color: var(--color-primary);
    color: #ffffff;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    transition: all 0.3s ease;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.cta-button:hover {
    background-color: var(--color-primary-dark);
    border-color: var(--color-primary-dark);
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.15);
    transform: translateY(-2px);
}

/* ---------------------------------------------------- */
/* 5. Tools Grid & Cards (Clean, White Cards)           */
/* ---------------------------------------------------- */

.tools-section {
    padding: var(--spacing-lg) 0;
    background-color: var(--color-background);
}

.tool-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
    padding-top: var(--spacing-md);
}

.tool-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    padding: var(--spacing-lg);
    transition: all 0.3s ease;
    cursor: pointer;
    position: relative;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

.tool-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
    border-color: var(--color-primary);
}

.tool-card h3 {
    color: var(--color-primary); /* Use primary color for titles */
    font-size: 1.5rem;
    margin: 1rem 0 0.5rem 0;
}

.tool-card p {
    color: var(--color-text-muted);
}

.tool-icon {
    font-size: 3rem;
}

.placeholder-card {
    opacity: 0.6;
}
.placeholder-card:hover {
    opacity: 1;
}


/* ---------------------------------------------------- */
/* 6. Tool Page Styles (Drop Zone, etc.)                */
/* ---------------------------------------------------- */

.tool-area {
    text-align: center;
    padding: 3rem 0;
}
.tool-area h2 {
    font-size: 2.5rem;
    color: var(--color-text-dark);
    margin-bottom: 1rem;
}

.drop-zone {
    border: 3px dashed var(--color-border);
    border-radius: 12px;
    padding: 4rem 2rem;
    margin: 2rem auto;
    max-width: 600px;
    cursor: pointer;
    transition: all 0.2s ease;
    position: relative;
    background-color: var(--color-surface);
}
.drop-zone:hover, .drop-zone.drag-over {
    border-color: var(--color-primary);
    background-color: #fdfdfd;
}
.drop-zone h3 {
    color: var(--color-primary);
    margin-bottom: 0.5rem;
}

.file-list {
    margin-top: 1rem;
    list-style: none;
    padding: 0;
    max-width: 600px;
    margin: 1rem auto;
}
.file-list li {
    background-color: var(--color-surface);
    padding: 0.75rem 1rem;
    margin-bottom: 0.5rem;
    border: 1px solid var(--color-border);
    border-left: 4px solid var(--color-primary);
    color: var(--color-text-dark);
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-radius: 4px;
    font-size: 0.9rem;
}

#page-range-input,
.password-fields input {
    width: 100%;
    max-width: 600px;
    padding: 0.75rem;
    margin-top: 1rem;
    font-size: 1rem;
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    color: var(--color-text-dark);
    border-radius: 4px;
}
.password-fields input {
    margin-top: 0.5rem;
}

#progress-text {
    color: var(--color-primary);
    margin-top: 1rem;
    font-weight: 600;
}

/* ---------------------------------------------------- */
/* 7. Media Queries (Mobile-First)                      */
/* ---------------------------------------------------- */

@media (max-width: 768px) {
    .hero-section {
        padding: 4rem 0;
    }
    .hero-tagline {
        font-size: 2.5rem;
    }
    .hero-subtitle {
        font-size: 1rem;
    }
    .tool-grid {
        grid-template-columns: 1fr 1fr; /* Two columns on mobile */
        gap: var(--spacing-sm);
    }
    .tool-card {
        padding: 1.5rem 1rem;
    }
    .tool-card h3 {
        font-size: 1.1rem;
    }
    .tool-icon {
        font-size: 2rem;
    }
}