:root {
    --bg-color: #0a0a0c;
    --card-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
    --primary-glow: #6366f1;
    --secondary-glow: #a855f7;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --accent: #38bdf8;
    --success: #10b981;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

body {
    background-color: var(--bg-color);
    color: var(--text-main);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    background-image: 
        radial-gradient(at 0% 0%, rgba(99, 102, 241, 0.15) 0px, transparent 50%),
        radial-gradient(at 100% 0%, rgba(168, 85, 247, 0.15) 0px, transparent 50%);
    overflow-x: hidden;
}

.container {
    width: 100%;
    max-width: 1000px;
    padding: 2rem;
    margin-top: 4rem;
}

header {
    text-align: center;
    margin-bottom: 4rem;
    animation: fadeInDown 0.8s ease-out;
}

header h1 {
    font-size: 3.5rem;
    font-weight: 800;
    background: linear-gradient(to right, #fff, #94a3b8);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 1rem;
    letter-spacing: -0.02em;
}

header p {
    color: var(--text-muted);
    font-size: 1.2rem;
}

.upload-card {
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    padding: 3rem;
    text-align: center;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.upload-card:hover {
    border-color: rgba(255, 255, 255, 0.2);
    transform: translateY(-4px);
}

.upload-area {
    border: 2px dashed var(--glass-border);
    border-radius: 16px;
    padding: 4rem 2rem;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
}

.upload-area:hover {
    background: rgba(255, 255, 255, 0.02);
    border-color: var(--primary-glow);
}

.upload-area.dragging {
    background: rgba(99, 102, 241, 0.1);
    border-color: var(--primary-glow);
    transform: scale(1.02);
}

.upload-icon {
    font-size: 3rem;
    margin-bottom: 1.5rem;
    display: block;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-glow), var(--secondary-glow));
    color: white;
    border: none;
    padding: 1rem 2.5rem;
    border-radius: 12px;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: 0 10px 15px -3px rgba(99, 102, 241, 0.3);
    margin-top: 2rem;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 20px 25px -5px rgba(99, 102, 241, 0.4);
    filter: brightness(1.1);
}

.btn-primary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-secondary {
    background: transparent;
    color: var(--text-main);
    border: 1px solid var(--glass-border);
    padding: 1rem 2.5rem;
    border-radius: 12px;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: var(--text-muted);
}

.results-section {
    margin-top: 4rem;
    display: none;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    width: 100%;
}

.result-card {
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    padding: 1.5rem;
    text-align: center;
    animation: fadeInUp 0.6s ease-out backwards;
}

.result-preview {
    width: 100%;
    aspect-ratio: 1/1;
    background: #000;
    border-radius: 12px;
    margin-bottom: 1.5rem;
    object-fit: cover;
    border: 1px solid var(--glass-border);
}

.download-btn {
    background: rgba(255, 255, 255, 0.1);
    color: white;
    border: 1px solid var(--glass-border);
    padding: 0.75rem 1.5rem;
    border-radius: 10px;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transition: var(--transition);
}

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

#status {
    margin-top: 1.5rem;
    font-size: 0.9rem;
    color: var(--text-muted);
}

footer {
    margin-top: auto;
    padding: 2rem;
    color: var(--text-muted);
    font-size: 0.8rem;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
}

.footer-credit {
    color: var(--text-muted);
    font-size: 0.8rem;
}

.visitor-counter {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    padding: 0.4rem 1.1rem;
    border-radius: 999px;
    font-size: 0.85rem;
    color: var(--text-muted);
    backdrop-filter: blur(8px);
    animation: fadeInUp 0.8s ease-out 0.5s backwards;
    transition: var(--transition);
}

.visitor-counter:hover {
    border-color: rgba(99, 102, 241, 0.4);
    background: rgba(99, 102, 241, 0.08);
}

.visitor-icon {
    font-size: 0.9rem;
}

.visitor-number {
    font-weight: 700;
    font-size: 1rem;
    background: linear-gradient(135deg, var(--primary-glow), var(--secondary-glow));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    min-width: 2ch;
    text-align: center;
    transition: var(--transition);
}

@keyframes countUp {
    from { opacity: 0; transform: translateY(4px); }
    to   { opacity: 1; transform: translateY(0); }
}

.visitor-number.updated {
    animation: countUp 0.4s ease-out;
}

@keyframes fadeInDown {
    from { opacity: 0; transform: translateY(-20px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Hidden canvas for processing */
#processCanvas {
    display: none;
}

#fileInput {
    display: none;
}

.crop-container {
    width: 100%;
    aspect-ratio: 2 / 1;
    overflow: hidden;
    position: relative;
    border: 2px solid var(--primary-glow);
    border-radius: 12px;
    background: #000;
    cursor: grab;
}

.crop-container:active {
    cursor: grabbing;
}

#cropImage {
    position: absolute;
    top: 0;
    left: 0;
    transform-origin: top left;
    will-change: transform;
    user-select: none;
    -webkit-user-drag: none;
}

@media (max-width: 768px) {
    .container {
        padding: 1rem;
        margin-top: 1.5rem;
    }

    header {
        margin-bottom: 2rem;
    }

    header h1 {
        font-size: 2.2rem;
    }

    header p {
        font-size: 1rem;
    }

    .upload-card {
        padding: 1.5rem 1rem;
        border-radius: 16px;
    }

    .upload-area {
        padding: 2.5rem 1rem;
    }

    .upload-icon {
        font-size: 2.5rem;
    }

    .upload-area h3 {
        font-size: 0.95rem;
    }

    /* Touch-friendly buttons (min 48px per Apple HIG) */
    .btn-primary,
    .btn-secondary {
        width: 100%;
        padding: 1rem 1.5rem;
        min-height: 52px;
        font-size: 1rem;
        border-radius: 14px;
    }

    .results-section {
        grid-template-columns: 1fr;
        gap: 1.5rem;
        margin-top: 2rem;
    }

    .result-card {
        padding: 1rem;
    }

    /* Full-width download / share buttons on mobile */
    .download-btn {
        width: 100%;
        justify-content: center;
        min-height: 52px;
        font-size: 1rem;
        border-radius: 12px;
        padding: 0.9rem 1.5rem;
    }

    /* Crop container stays 2:1 but fits narrow screens */
    .crop-container {
        aspect-ratio: 2 / 1;
        border-radius: 10px;
    }

    /* Visitor counter fits on one line on narrow screens */
    .visitor-counter {
        font-size: 0.8rem;
        padding: 0.35rem 0.9rem;
    }
}

/* Handle notched / home-bar iPhones */
@supports (padding-bottom: env(safe-area-inset-bottom)) {
    footer {
        padding-bottom: calc(1.5rem + env(safe-area-inset-bottom));
    }
}