/* ===================================
   Modern Reactive Theme
   =================================== */
:root {
    /* Modern Palette (Fresh Blue/Cyan) */
    --bg-color: #0b1121;
    /* Slightly deeper blue-black */
    --accent-primary: #06b6d4;
    /* Cyan-500 */
    --accent-secondary: #3b82f6;
    /* Blue-500 */
    --accent-tertiary: #8b5cf6;
    /* Violet-500 */

    /* Surface Colors */
    --surface-glass: rgba(255, 255, 255, 0.03);
    --surface-glass-hover: rgba(255, 255, 255, 0.08);
    --border-glass: rgba(255, 255, 255, 0.08);

    /* Text */
    --text-main: #f8fafc;
    --text-muted: #94a3b8;

    /* Spacing & Radius */
    --radius-pill: 9999px;
    --radius-card: 32px;
    --radius-sm: 12px;

    /* Animation */
    --bounce: cubic-bezier(0.34, 1.56, 0.64, 1);
}

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

body {
    font-family: 'Inter', -apple-system, system-ui, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    min-height: 100vh;
    overflow-x: hidden;
    display: flex;
    justify-content: center;
    align-items: center;
    direction: ltr;
    position: relative;
    /* Ensure LTR */
}

#bgCanvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    pointer-events: none;
}

/* ===================================
   Reactive Background
   =================================== */
body::before {
    content: '';
    position: fixed;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle at center, transparent 30%, var(--bg-color) 70%),
        conic-gradient(from 0deg at 50% 50%,
            var(--accent-primary) 0deg,
            var(--accent-secondary) 120deg,
            var(--accent-tertiary) 240deg,
            var(--accent-primary) 360deg);
    filter: blur(60px);
    opacity: 0.4;
    animation: rotateBG 25s linear infinite;
    z-index: -2;
    pointer-events: none;
    will-change: transform;
}

@keyframes rotateBG {
    0% {
        transform: rotate(0deg);
    }

    100% {
        transform: rotate(360deg);
    }
}

/* Floating Particles (Reactive feel) */
/* Second Nebula Layer for Depth */
body::after {
    content: '';
    position: fixed;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle at 60% 40%, rgba(236, 72, 153, 0.15), transparent 40%),
        radial-gradient(circle at 40% 60%, rgba(59, 130, 246, 0.15), transparent 40%);
    animation: floatingNebula 15s ease-in-out infinite alternate;
    z-index: -1;
    pointer-events: none;
    will-change: transform;
}

@keyframes floatingNebula {
    0% {
        transform: scale(1) translate(0, 0);
    }

    100% {
        transform: scale(1.1) translate(-20px, 20px);
    }
}

/* Hidden File Input */
.file-input {
    display: none;
}

/* ===================================
   Layout
   =================================== */
.container {
    width: 100%;
    max-width: 1000px;
    padding: 2rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 3rem;
}

/* ===================================
   Header
   =================================== */
.header {
    text-align: center;
    animation: slideUp 0.6s var(--bounce);
}

.main-title {
    font-size: 3.5rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    background: linear-gradient(to right, #fff, #cbd5e1);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 0.5rem;
}

.subtitle {
    font-size: 1.1rem;
    color: var(--text-muted);
    font-weight: 400;
}

/* ===================================
   Navigation (Pill Style)
   =================================== */
.category-buttons {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
    background: rgba(0, 0, 0, 0.2);
    padding: 0.5rem;
    border-radius: var(--radius-pill);
    border: 1px solid var(--border-glass);
    animation: scaleIn 0.5s var(--bounce) 0.1s backwards;
}

.category-wrapper {
    position: relative;
}

.category-btn {
    background: transparent;
    border: none;
    padding: 0.8rem 1.5rem;
    border-radius: var(--radius-pill);
    color: var(--text-muted);
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.category-btn:hover {
    color: white;
    background: var(--surface-glass-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(6, 182, 212, 0.15);
}

.category-btn.active {
    background: white;
    color: var(--bg-color);
    box-shadow: 0 8px 20px rgba(255, 255, 255, 0.3);
    transform: translateY(-2px) scale(1.05);
}

.category-btn:hover .icon svg {
    transform: scale(1.1) rotate(5deg);
    stroke: var(--accent-primary);
}

.category-btn .icon svg {
    width: 20px;
    height: 20px;
    stroke-width: 2.5;
    transition: transform 0.3s var(--bounce), stroke 0.3s ease;
}

.dropdown-arrow {
    font-size: 0.7rem;
    opacity: 0.5;
    transition: transform 0.2s;
}

.category-wrapper.open .dropdown-arrow {
    transform: rotate(180deg);
}

/* Dropdown Menu */
.dropdown-menu {
    position: absolute;
    top: calc(100% + 15px);
    left: 50%;
    transform: translateX(-50%) translateY(-10px);
    background: #1e293b;
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-sm);
    padding: 0.5rem;
    min-width: 160px;
    opacity: 0;
    visibility: hidden;
    transition: all 0.2s ease;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.3);
    z-index: 100;
}

.category-wrapper.open .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}

.dropdown-item {
    color: var(--text-muted);
    padding: 0.6rem 1rem;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.2s;
    text-align: center;
}

.dropdown-item:hover {
    background: var(--accent-primary);
    color: white;
}

/* ===================================
   Converter Card (Clean & Modern)
   =================================== */
.cloud-container {
    width: 100%;
    max-width: 700px;
    animation: slideUp 0.7s var(--bounce) 0.2s backwards;
}

.cloud-box {
    position: relative;
    background: #1e293b;
    border-radius: var(--radius-card);
    padding: 2px;
    /* Thinner sophisticated border */
    /* Subtle ambient glow instead of hard shadow */
    box-shadow: 0 0 20px rgba(59, 130, 246, 0.1),
        0 0 0 1px rgba(255, 255, 255, 0.05);
    overflow: hidden;
    /* Restore clipping */
    transition: transform 0.3s var(--bounce), box-shadow 0.3s ease;
}

.cloud-box::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    /* Slower, softer gradient rotation */
    background: conic-gradient(transparent, rgba(59, 130, 246, 0.3), rgba(6, 182, 212, 0.3), transparent 40%);
    animation: rotateBorder 6s linear infinite;
    /* Slower = more premium */
    z-index: 0;
    pointer-events: none;
    /* Fix: don't block clicks */
}

.cloud-box::after {
    content: '';
    position: absolute;
    inset: 2px;
    background: #161e2e;
    /* Slightly lighter than pure dark for legibility */
    border-radius: calc(var(--radius-card) - 2px);
    z-index: 0;
    pointer-events: none;
    /* Fix: don't block clicks */
}

/* Ensure content is above the border layers */
.cloud-box>* {
    position: relative;
    z-index: 1;
}

/* Interactive Hover Glow */
.cloud-box:hover {
    transform: translateY(-2px);
    /* Subtle lift */
    /* Reactive glow on hover */
    box-shadow: 0 0 30px rgba(59, 130, 246, 0.25),
        0 0 0 1px rgba(59, 130, 246, 0.3);
}

@keyframes rotateBorder {
    0% {
        transform: rotate(0deg);
    }

    100% {
        transform: rotate(360deg);
    }
}

.upload-area {
    border: 2px dashed var(--border-glass);
    border-radius: var(--radius-card);
    padding: 3rem 2rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    background: rgba(0, 0, 0, 0.1);
}

.upload-area:hover {
    border-color: var(--accent-primary);
    background: rgba(59, 130, 246, 0.05);
    /* Slight blue tint */
    transform: translateY(-2px);
}

.upload-icon svg {
    width: 60px;
    height: 60px;
    stroke: var(--text-muted);
    margin-bottom: 1.5rem;
    transition: all 0.3s var(--bounce);
}

.upload-area:hover .upload-icon svg {
    stroke: var(--accent-primary);
    transform: scale(1.1) rotate(5deg);
}

.upload-title {
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.upload-description {
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* File Info */
.file-info {
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-sm);
    padding: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border: 1px solid var(--border-glass);
    margin-bottom: 2rem;
}

.file-details {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.file-icon svg {
    width: 24px;
    height: 24px;
    stroke: var(--accent-primary);
}

.file-name {
    font-weight: 600;
}

.remove-file-btn {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 1.2rem;
    transition: color 0.2s;
}

.remove-file-btn:hover {
    color: #ef4444;
    /* Red */
}

/* Selection */
.format-selection {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 2rem;
}

.format-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-muted);
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.format-select {
    width: 100%;
    min-width: 140px;
    padding: 0.8rem 1rem;
    padding-right: 2.5rem;
    /* Space for arrow */
    background: #1e293b url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%2394a3b8'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M19 9l-7 7-7-7'%3E%3C/path%3E%3C/svg%3E") no-repeat right 0.8rem center/1.2rem;
    appearance: none;
    -webkit-appearance: none;
    -moz-appearance: none;
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-sm);
    color: white;
    outline: none;
    font-size: 1rem;
    cursor: pointer;
    transition: border-color 0.2s;
}

.format-select:focus {
    border-color: var(--accent-primary);
}

.arrow-icon {
    color: var(--text-muted);
    font-size: 1.5rem;
    margin-top: 1.2rem;
    /* Align with inputs */
}

/* Convert Button (Modern Pill) */
.convert-btn {
    width: 100%;
    padding: 1.2rem;
    border: none;
    border-radius: var(--radius-pill);
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: white;
    font-size: 1.1rem;
    font-weight: 700;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0.8rem;
    transition: all 0.3s var(--bounce);
    box-shadow: 0 10px 20px -5px rgba(59, 130, 246, 0.4);
}

.convert-btn:hover {
    transform: translateY(-3px) scale(1.02);
    box-shadow: 0 15px 30px -5px rgba(59, 130, 246, 0.5);
    filter: brightness(1.1);
}

.convert-btn:active {
    transform: scale(0.98);
}

.btn-icon svg {
    width: 20px;
    height: 20px;
}

/* Progress */
.progress-container {
    margin-top: 2rem;
}

.progress-bar {
    height: 6px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    overflow: hidden;
    margin-bottom: 0.5rem;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--accent-primary), var(--accent-tertiary));
    width: 0%;
    transition: width 0.3s ease;
}

.progress-text {
    text-align: center;
    font-size: 0.9rem;
    color: var(--text-muted);
}

/* Footer */
.footer {
    opacity: 0.5;
    font-size: 0.9rem;
    margin-top: auto;
}

/* Animations */
@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }

    to {
        opacity: 1;
        transform: scale(1);
    }
}

/* Responsive */
@media (max-width: 768px) {
    .main-title {
        font-size: 2.2rem;
        padding: 0 1rem;
    }

    .container {
        padding: 1rem;
        gap: 1.5rem;
        /* Tighter gap for mobile */
    }

    .cloud-box {
        padding: 1.5rem;
    }

    .upload-area {
        padding: 2rem 1rem;
    }

    .category-buttons {
        gap: 0.5rem;
        padding: 0.4rem;
        width: 100%;
        overflow: visible;
        /* Fix: allow dropdowns to show */
        justify-content: center;
        flex-wrap: wrap;
        /* Fix: stack buttons instead of hidden scroll */
        border-radius: 20px;
    }

    .category-buttons::-webkit-scrollbar {
        display: none;
        /* Chrome/Safari */
    }

    .category-btn {
        padding: 0.6rem 1rem;
        font-size: 0.9rem;
        white-space: nowrap;
    }

    .format-selection {
        flex-direction: column;
        gap: 1rem;
    }

    .arrow-icon {
        transform: rotate(90deg);
        margin: 0.5rem 0;
        /* Add vertical spacing */
    }

    /* Optimize background for mobile */
    body::before {
        filter: blur(30px);
        width: 150%;
        height: 150%;
    }
}

@media (max-width: 480px) {
    .cloud-box {
        padding: 1rem;
    }

    .main-title {
        font-size: 1.6rem;
    }

    .file-info {
        flex-direction: column;
        gap: 0.8rem;
        text-align: center;
        width: 100%;
    }

    .file-details {
        flex-direction: column;
        gap: 0.5rem;
    }

    .logo-container {
        gap: 0.5rem;
    }

    .logo-text {
        font-size: 2rem;
    }

    .logo-icon {
        width: 2.5rem;
        height: 2.5rem;
    }
}

/* Logo Styles */
.logo-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 0.5rem;
}

.logo-icon {
    width: 2.8rem;
    height: 2.8rem;
    filter: drop-shadow(0 0 10px rgba(236, 72, 153, 0.3));
}

.logo-text {
    font-size: 1.8rem;
    font-weight: 800;
    letter-spacing: -1px;
    margin: 0;
    line-height: 1;
}

.logo-accent {
    background: linear-gradient(to right, #06b6d4, #3b82f6);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}