/* ============================================================
   FileConverter Pro — iLovePDF-Inspired Premium Stylesheet
   ============================================================ */

/* ---------- Google Fonts ---------- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&display=swap');

/* ---------- CSS Custom Properties ---------- */
:root {
    /* Brand Palette */
    --primary:        #E5322D;
    --primary-dark:   #C4201C;
    --primary-light:  #FF6B66;
    --primary-glow:   rgba(229, 50, 45, 0.25);

    /* Neutrals */
    --bg-body:        #F5F5F7;
    --bg-card:        #FFFFFF;
    --bg-dark:        #1E1E2E;
    --bg-darker:      #15151F;
    --text-primary:   #1E1E2E;
    --text-secondary: #6B7280;
    --text-light:     #9CA3AF;
    --border:         #E5E7EB;
    --border-light:   #F0F0F2;

    /* Accent */
    --accent-blue:    #3B82F6;
    --accent-green:   #10B981;
    --accent-purple:  #8B5CF6;
    --accent-orange:  #F59E0B;
    --accent-pink:    #EC4899;
    --accent-teal:    #14B8A6;

    /* Shadows */
    --shadow-sm:      0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
    --shadow-md:      0 4px 6px rgba(0,0,0,0.05), 0 2px 4px rgba(0,0,0,0.04);
    --shadow-lg:      0 10px 25px rgba(0,0,0,0.08), 0 4px 10px rgba(0,0,0,0.04);
    --shadow-xl:      0 20px 50px rgba(0,0,0,0.12), 0 8px 20px rgba(0,0,0,0.06);
    --shadow-card:    0 2px 16px rgba(0,0,0,0.06);
    --shadow-card-hover: 0 12px 40px rgba(229,50,45,0.15), 0 4px 12px rgba(0,0,0,0.08);

    /* Transitions */
    --transition-fast:   0.2s cubic-bezier(0.4,0,0.2,1);
    --transition-smooth: 0.35s cubic-bezier(0.4,0,0.2,1);
    --transition-spring: 0.5s cubic-bezier(0.34,1.56,0.64,1);

    /* Radii */
    --radius-sm:  8px;
    --radius-md:  12px;
    --radius-lg:  16px;
    --radius-xl:  20px;
    --radius-pill: 50px;
}

/* ---------- Global Reset ---------- */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg-body);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

/* ---------- Scrollbar ---------- */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--bg-body); }
::-webkit-scrollbar-thumb {
    background: #ccc;
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover { background: #aaa; }

/* ============================================================
   NAVBAR
   ============================================================ */
.navbar-main {
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid var(--border-light);
    padding: 0.75rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: box-shadow var(--transition-fast);
}

.navbar-main.scrolled {
    box-shadow: var(--shadow-md);
}

.navbar-brand-custom {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    font-weight: 800;
    font-size: 1.4rem;
    color: var(--text-primary);
    letter-spacing: -0.5px;
}

.navbar-brand-custom .brand-icon {
    width: 38px;
    height: 38px;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 1.1rem;
    box-shadow: 0 4px 12px var(--primary-glow);
}

.navbar-brand-custom span {
    color: var(--primary);
}

/* ============================================================
   HERO SECTION
   ============================================================ */
.hero-section {
    text-align: center;
    padding: 4rem 0 2.5rem;
    position: relative;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: -100px;
    left: 50%;
    transform: translateX(-50%);
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, var(--primary-glow) 0%, transparent 70%);
    opacity: 0.4;
    pointer-events: none;
    z-index: 0;
}

.hero-section h1 {
    font-size: 2.8rem;
    font-weight: 900;
    color: var(--text-primary);
    letter-spacing: -1.5px;
    line-height: 1.15;
    margin-bottom: 1rem;
    position: relative;
    z-index: 1;
}

.hero-section h1 .text-gradient {
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-section p {
    font-size: 1.15rem;
    color: var(--text-secondary);
    max-width: 560px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
    font-weight: 400;
}

/* ============================================================
   TOOLS GRID
   ============================================================ */
.tools-section {
    padding: 1rem 0 5rem;
}

.tools-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    max-width: 1000px;
    margin: 0 auto;
}

/* ---------- Tool Card ---------- */
.tool-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 2.2rem 1.8rem;
    text-align: center;
    cursor: pointer;
    text-decoration: none;
    color: var(--text-primary);
    position: relative;
    overflow: hidden;
    transition:
        transform var(--transition-spring),
        box-shadow var(--transition-smooth),
        border-color var(--transition-fast);
}

.tool-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--card-accent, var(--primary)), var(--card-accent-end, var(--primary-light)));
    opacity: 0;
    transition: opacity var(--transition-smooth);
}

.tool-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-card-hover);
    border-color: transparent;
}

.tool-card:hover::before {
    opacity: 1;
}

.tool-card:active {
    transform: translateY(-2px) scale(0.98);
}

/* Card icon */
.tool-card .card-icon {
    width: 72px;
    height: 72px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    margin: 0 auto 1.2rem;
    background: var(--card-icon-bg, #FEE2E2);
    color: var(--card-icon-color, var(--primary));
    transition: transform var(--transition-spring);
}

.tool-card:hover .card-icon {
    transform: scale(1.08) rotate(-3deg);
}

.tool-card h3 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    letter-spacing: -0.3px;
}

.tool-card p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.5;
    margin: 0;
}

.tool-card .card-arrow {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin-top: 1rem;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--bg-body);
    color: var(--text-light);
    font-size: 0.9rem;
    transition: all var(--transition-smooth);
}

.tool-card:hover .card-arrow {
    background: var(--primary);
    color: #fff;
    transform: translateX(4px);
}

/* Card color variants */
.tool-card[data-tool="pdf-to-word"] {
    --card-accent: #3B82F6; --card-accent-end: #60A5FA;
    --card-icon-bg: #EFF6FF; --card-icon-color: #3B82F6;
}
.tool-card[data-tool="word-to-pdf"] {
    --card-accent: #E5322D; --card-accent-end: #FF6B66;
    --card-icon-bg: #FEE2E2; --card-icon-color: #E5322D;
}
.tool-card[data-tool="pdf-to-excel"] {
    --card-accent: #10B981; --card-accent-end: #34D399;
    --card-icon-bg: #ECFDF5; --card-icon-color: #10B981;
}
.tool-card[data-tool="excel-to-pdf"] {
    --card-accent: #F59E0B; --card-accent-end: #FBBF24;
    --card-icon-bg: #FFFBEB; --card-icon-color: #F59E0B;
}
.tool-card[data-tool="pdf-to-ppt"] {
    --card-accent: #8B5CF6; --card-accent-end: #A78BFA;
    --card-icon-bg: #F5F3FF; --card-icon-color: #8B5CF6;
}
.tool-card[data-tool="ppt-to-pdf"] {
    --card-accent: #EC4899; --card-accent-end: #F472B6;
    --card-icon-bg: #FDF2F8; --card-icon-color: #EC4899;
}

/* ============================================================
   TOOL PAGE  (Upload & Convert)
   ============================================================ */
.tool-page {
    max-width: 720px;
    margin: 0 auto;
    padding: 2rem 1rem 5rem;
}

.tool-header {
    text-align: center;
    margin-bottom: 2.5rem;
}

.tool-header .back-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: 1.5rem;
    transition: color var(--transition-fast);
}

.tool-header .back-link:hover {
    color: var(--primary);
}

.tool-header h2 {
    font-size: 2rem;
    font-weight: 800;
    letter-spacing: -1px;
    margin-bottom: 0.5rem;
}

.tool-header p {
    color: var(--text-secondary);
    font-size: 1rem;
}

/* ---------- Upload Zone ---------- */
.upload-zone {
    border: 2.5px dashed var(--border);
    border-radius: var(--radius-xl);
    padding: 3.5rem 2rem;
    text-align: center;
    background: var(--bg-card);
    cursor: pointer;
    transition: all var(--transition-smooth);
    position: relative;
    overflow: hidden;
}

.upload-zone::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(229,50,45,0.03), rgba(229,50,45,0.01));
    opacity: 0;
    transition: opacity var(--transition-smooth);
}

.upload-zone:hover,
.upload-zone.drag-over {
    border-color: var(--primary);
    background: #FFFBFB;
    box-shadow: 0 0 0 4px var(--primary-glow);
}

.upload-zone:hover::before,
.upload-zone.drag-over::before {
    opacity: 1;
}

.upload-zone .upload-icon {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: linear-gradient(135deg, #FEE2E2, #FECACA);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: var(--primary);
    margin: 0 auto 1.2rem;
    transition: transform var(--transition-spring);
}

.upload-zone:hover .upload-icon {
    transform: scale(1.1) translateY(-4px);
}

.upload-zone h4 {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 0.4rem;
    color: var(--text-primary);
}

.upload-zone p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.upload-zone .btn-select {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 0.65rem 1.6rem;
    background: var(--primary);
    color: #fff;
    border: none;
    border-radius: var(--radius-pill);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    margin-top: 1rem;
    transition: all var(--transition-fast);
    box-shadow: 0 4px 14px var(--primary-glow);
    position: relative;
    z-index: 1;
}

.upload-zone .btn-select:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: 0 6px 20px var(--primary-glow);
}

/* ---------- Progress State ---------- */
.upload-progress {
    display: none;
    margin-top: 2rem;
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 2rem;
    border: 1px solid var(--border);
}

.upload-progress.active {
    display: block;
}

.progress-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1rem;
}

.progress-header .file-info {
    display: flex;
    align-items: center;
    gap: 12px;
}

.progress-header .file-icon {
    width: 44px;
    height: 44px;
    border-radius: var(--radius-sm);
    background: #FEE2E2;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
    font-size: 1.2rem;
}

.progress-header .file-name {
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--text-primary);
}

.progress-header .file-size {
    font-size: 0.8rem;
    color: var(--text-light);
}

.progress-bar-container {
    width: 100%;
    height: 8px;
    background: var(--bg-body);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 0.8rem;
}

.progress-bar-fill {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--primary), var(--primary-light));
    border-radius: 4px;
    transition: width 0.3s ease;
    position: relative;
}

.progress-bar-fill::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(90deg,
        transparent 0%,
        rgba(255,255,255,0.3) 50%,
        transparent 100%
    );
    animation: shimmer 1.5s infinite;
}

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

.progress-text {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-weight: 500;
}

/* ---------- Processing State ---------- */
.processing-state {
    display: none;
    text-align: center;
    padding: 3rem 2rem;
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
    margin-top: 2rem;
}

.processing-state.active {
    display: block;
}

.processing-spinner {
    width: 64px;
    height: 64px;
    border: 4px solid var(--border);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin: 0 auto 1.5rem;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.processing-state h4 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 0.4rem;
}

.processing-state p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* ---------- Success State ---------- */
.success-state {
    display: none;
    text-align: center;
    padding: 3rem 2rem;
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    border: 1px solid #D1FAE5;
    margin-top: 2rem;
}

.success-state.active {
    display: block;
}

.success-icon {
    width: 72px;
    height: 72px;
    border-radius: 50%;
    background: linear-gradient(135deg, #D1FAE5, #A7F3D0);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: #059669;
    margin: 0 auto 1.2rem;
    animation: popIn 0.4s cubic-bezier(0.34,1.56,0.64,1);
}

@keyframes popIn {
    0% { transform: scale(0); opacity: 0; }
    100% { transform: scale(1); opacity: 1; }
}

.success-state h4 {
    font-size: 1.1rem;
    font-weight: 700;
    color: #059669;
    margin-bottom: 0.4rem;
}

.success-state p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 1.5rem;
}

.btn-download {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 0.75rem 2rem;
    background: linear-gradient(135deg, #059669, #10B981);
    color: #fff;
    border: none;
    border-radius: var(--radius-pill);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    transition: all var(--transition-fast);
    box-shadow: 0 4px 14px rgba(16,185,129,0.3);
}

.btn-download:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(16,185,129,0.4);
    color: #fff;
}

.btn-convert-another {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 0.65rem 1.4rem;
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-pill);
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    text-decoration: none;
    margin-top: 0.8rem;
    transition: all var(--transition-fast);
}

.btn-convert-another:hover {
    border-color: var(--primary);
    color: var(--primary);
}

/* ---------- Error State ---------- */
.error-state {
    display: none;
    text-align: center;
    padding: 2.5rem 2rem;
    background: #FFF5F5;
    border-radius: var(--radius-lg);
    border: 1px solid #FECACA;
    margin-top: 2rem;
}

.error-state.active {
    display: block;
}

.error-state .error-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.error-state h4 {
    font-size: 1rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 0.4rem;
}

.error-state p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* ============================================================
   FOOTER
   ============================================================ */
.footer-main {
    text-align: center;
    padding: 2rem 0;
    color: var(--text-light);
    font-size: 0.85rem;
    border-top: 1px solid var(--border-light);
    background: var(--bg-card);
}

.footer-main a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 500;
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 992px) {
    .tools-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .hero-section h1 {
        font-size: 2.2rem;
    }
}

@media (max-width: 576px) {
    .tools-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    .hero-section {
        padding: 3rem 0 2rem;
    }
    .hero-section h1 {
        font-size: 1.8rem;
    }
    .tool-card {
        padding: 1.8rem 1.5rem;
    }
    .upload-zone {
        padding: 2.5rem 1.5rem;
    }
}

/* ============================================================
   UTILITY ANIMATIONS
   ============================================================ */
.fade-up {
    opacity: 0;
    transform: translateY(30px);
}

.stagger-item {
    opacity: 0;
    transform: translateY(20px);
}

/* Pulse ring for brand icon */
@keyframes pulse-ring {
    0% { box-shadow: 0 0 0 0 var(--primary-glow); }
    70% { box-shadow: 0 0 0 12px rgba(229,50,45,0); }
    100% { box-shadow: 0 0 0 0 rgba(229,50,45,0); }
}

.brand-icon:hover {
    animation: pulse-ring 1s ease;
}