/* Fonts */

@import url('https://fonts.googleapis.com/css2?family=Inter:ital,opsz,wght@0,14..32,100..900;1,14..32,100..900&display=swap');

/* Variables */

:root {
    /* Gallery layout */
    --gallery-gap: 0.1rem;
    --gallery-imagePerRow: 9;
    
    /* Color palette - Dark theme */
    --bg-primary: #0a0a0a;
    --bg-secondary: #141414;
    --bg-tertiary: #1a1a1a;
    --text-primary: #ffffff;
    --text-secondary: #a0a0a0;
    --accent: #ffffff;
    --border: #252525;
}

/* Base */

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

body {
    position: relative;
    font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
}

/* Nav */

nav {
    position: sticky;
    top: 0;
    z-index: 10;
    background-color: var(--bg-secondary);
    padding: 16px 32px;
    font-size: 1.25rem;
    font-weight: 500;
    letter-spacing: -0.01em;
    border-bottom: 1px solid var(--border);
}

/* Preferences */

.container {
    position: sticky;
    top: 57px;
    z-index: 9;
    background-color: var(--bg-primary);
    padding: 16px 32px;
    border-bottom: 1px solid var(--border);
}

#preferences {
    display: flex;
    justify-content: space-between;
}

/* Slider wrapper and controls */
#slider-wrapper {
    display: inline-flex;
    align-items: center;
    gap: 12px;
}

.slider-button {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 32px;
    height: 32px;
    font-size: 0.75rem;
    color: var(--text-secondary);
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.15s ease;
}

.slider-button:hover {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
}

/* Range slider styling */
#slider {
    -webkit-appearance: none;
    appearance: none;
    width: 120px;
    height: 2px;
    background: var(--border);
    border-radius: 2px;
    outline: none;
    cursor: pointer;
    background-image: linear-gradient(var(--accent), var(--accent));
    background-size: 30% 100%;
    background-repeat: no-repeat;
    transition: opacity 0.15s ease;
}

#slider:hover {
    opacity: 1;
}

/* Slider thumb styling */
#slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 14px;
    height: 14px;
    background: var(--accent);
    border-radius: 50%;
    cursor: pointer;
}

#slider::-moz-range-thumb {
    width: 14px;
    height: 14px;
    background: var(--accent);
    border: none;
    border-radius: 50%;
    cursor: pointer;
}

/* Gallery grid */

#photo-container {
    display: grid;
    grid-template-columns: repeat(var(--gallery-imagePerRow), 1fr);
    width: 100%;
    gap: var(--gallery-gap);
    padding: var(--gallery-gap);
}

.photo-wrapper {
    width: 100%;
    /* Calculate height to maintain square aspect ratio */
    height: calc((100vw - var(--gallery-gap) * 2 - var(--gallery-gap) * (var(--gallery-imagePerRow) - 1)) / var(--gallery-imagePerRow));
    overflow: hidden;
    cursor: pointer;
}

.photo-wrapper:hover img {
    scale: 1.02;
}

.photo-wrapper img {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.2s ease;
}

/* Photo modal */

#photo-modal {
    position: fixed;
    top: 0;
    left: 0;
    z-index: 100;
    display: none;
    justify-content: center;
    align-items: center;
    width: 100vw;
    height: 100vh;
    background-color: rgba(0, 0, 0, 0.8);
}

#photo-modal.show-photo-modal {
    display: flex;
}

/* Modal image container */
#photo-modal-wrapper {
    height: 90vh;
    width: 70vw;
    overflow: hidden;
    display: flex;
    justify-content: center;
    align-items: center;
}

#photo-modal-wrapper > img {
    display: block;
    max-width: 100%;
    max-height: 100%;
}

/* Navigation buttons (prev/next) */
#photo-modal .modal-nav-btn {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 48px;
    width: 48px;
    padding: 0;
    font-size: 1.25rem;
    color: var(--text-primary);
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 50%;
    cursor: pointer;
    transition: all 0.15s ease;
}

#photo-modal .modal-nav-btn:hover {
    background-color: var(--bg-tertiary);
    border-color: var(--text-secondary);
}

#modal-prev.modal-nav-btn {
    margin-right: 2rem;
}

#modal-next.modal-nav-btn {
    margin-left: 2rem;
}

/* Config bar (zoom and rotate controls) */
#config-bar {
    position: absolute;
    bottom: 150px;
    display: inline-flex;
    gap: 4px;
    padding: 6px;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 8px;
}

/* Close button */
#modal-leave {
    position: absolute;
    top: 30px;
    right: 50px;
}

#modal-leave .button-wrapper {
    width: 44px;
    height: 44px;
}

#modal-leave i {
    font-size: 1.5rem;
}

/* Generic button wrapper for controls */
.button-wrapper {
    display: inline-flex;
    justify-content: center;
    align-items: center;
    width: 36px;
    height: 36px;
    font-size: 1rem;
    color: var(--text-secondary);
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.15s ease;
}

.button-wrapper:hover {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
}

/* Help modal */

/* Help button */
#help-btn {
    padding: 6px 14px;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-primary);
    background: transparent;
    border: 1px solid var(--border);
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.15s ease;
}

#help-btn:hover {
    background: var(--bg-tertiary);
}

/* Help modal overlay */
.help-modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: 1000;
    background: rgba(0, 0, 0, 0.8);
    justify-content: center;
    align-items: center;
}

.help-modal.show {
    display: flex;
}

/* Help modal content */
.help-content {
    max-width: 600px;
    max-height: 80vh;
    padding: 32px;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text-primary);
    overflow-y: auto;
}

.help-content h2 {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin: 0 0 24px 0;
    font-size: 1.25rem;
    font-weight: 600;
}

#help-close {
    padding: 4px;
    font-size: 1.25rem;
    color: var(--text-secondary);
    background: none;
    border: none;
    cursor: pointer;
    transition: color 0.15s ease;
}

#help-close:hover {
    color: var(--text-primary);
}

.help-content h3 {
    margin: 20px 0 12px 0;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-primary);
}

.help-content section:first-of-type h3 {
    margin-top: 0;
}

.help-content p {
    margin: 8px 0;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.help-content ul {
    margin: 8px 0;
    padding: 0;
    list-style: none;
}

.help-content li {
    padding: 6px 0;
    font-size: 0.85rem;
    line-height: 1.6;
    color: var(--text-secondary);
}

/* Keyboard key styling */
.help-content kbd {
    padding: 2px 6px;
    font-family: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, monospace;
    font-size: 0.8em;
    color: var(--text-primary);
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 4px;
}

/* Footer */

#site-footer {
    margin-top: 64px;
    padding: 32px;
    font-size: 0.8rem;
    color: var(--text-secondary);
    text-align: center;
    background: var(--bg-secondary);
    border-top: 1px solid var(--border);
}

#site-footer p {
    margin-bottom: 8px;
    font-weight: 400;
}

#site-footer p:last-child {
    margin: 0;
}

#site-footer a {
    color: var(--text-primary);
    text-decoration: none;
    transition: color 0.15s ease;
}

#site-footer a:hover {
    color: var(--text-secondary);
}

/* Mobile */
@media (max-width: 600px) {
    nav {
        padding: 12px 20px;
        font-size: 1.1rem;
    }
    .container {
        padding: 12px 20px;
        top: 56px; /* Slightly adjust sticky offset */
    }
    #slider {
        width: 100px;
    }
    /* Photo modal occupies full viewport */
    #photo-modal-wrapper {
        width: 100vw;
        height: 100vh;
    }
    #photo-modal .modal-nav-btn {
        height: 40px;
        width: 40px;
        font-size: 1rem;
        margin: 0 8px;
    }
    #config-bar {
        bottom: 32px;
        left: 50%;
        transform: translateX(-50%);
    }
    #modal-leave {
        top: 16px;
        right: 20px;
    }
    /* Help modal sizing & typography */
    .help-content {
        max-width: 90%;
        max-height: 90vh;
        padding: 24px;
    }
    .help-content h2 {
        font-size: 1.1rem;
    }
    .help-content h3 {
        font-size: 0.85rem;
    }
    .help-content li,
    .help-content p {
        font-size: 0.75rem;
    }
}