/* CSS Variables */
:root {
    --bg-primary: #0d1117;
    --bg-secondary: #161b22;
    --bg-tertiary: #21262d;
    --text-primary: #e6edf3;
    --text-secondary: #8b949e;
    --text-muted: #6e7681;
    --border-color: #30363d;
    --accent-primary: #58a6ff;
    --accent-success: #3fb950;
    --accent-warning: #d29922;
    --accent-danger: #f85149;
    --accent-primary-hover: #79b8ff;
    /* Alpha variants for backgrounds */
    --accent-primary-alpha: rgba(88, 166, 255, 0.2);
    --accent-primary-bg: rgba(88, 166, 255, 0.08);
    --accent-success-bg: rgba(63, 185, 80, 0.08);
    --accent-danger-bg: rgba(248, 81, 73, 0.08);
    --shadow-color: rgba(0, 0, 0, 0.4);
    --spinner-track: rgba(0, 0, 0, 0.2);
    --font-mono: 'SF Mono', 'Cascadia Code', 'Fira Code', Consolas, monospace;
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --shadow: 0 8px 24px var(--shadow-color);
    --transition: 150ms ease;
}

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

/* Utility classes */
.hidden,
[hidden],
.btn .hidden,
.btn-loading.hidden,
.btn-text.hidden {
    display: none;
}

/* Base */
html {
    font-size: 16px;
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

/* Layout */
.container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 1rem;
}

/* Card */
.card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    width: 100%;
    max-width: 700px;
    padding: 2rem;
    animation: fadeIn 200ms ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* States */
.state {
    text-align: center;
}

.state.hidden {
    display: none;
}

.state h2 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.state p {
    color: var(--text-secondary);
}

/* Icons */
.icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    display: block;
}

.icon.warning {
    color: var(--accent-warning);
}

/* Spinner */
.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border-color);
    border-top-color: var(--accent-primary);
    border-radius: 50%;
    margin: 0 auto 1rem;
    animation: spin 800ms linear infinite;
}

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

/* Forms */
#password-form {
    margin-top: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    max-width: 300px;
    margin-left: auto;
    margin-right: auto;
}

input[type="password"] {
    font-family: var(--font-sans);
    font-size: 1rem;
    padding: 0.75rem 1rem;
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    outline: none;
    transition: border-color var(--transition);
}

input[type="password"]:focus {
    border-color: var(--accent-primary);
}

input[type="password"]::placeholder {
    color: var(--text-muted);
}

/* =====================================================
   PIN CODE INPUT BOXES
   ===================================================== */

.pin-container {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 8px;
    margin: 1.5rem 0;
}

.pin-separator {
    width: 12px;
    height: 2px;
    background-color: var(--border-color);
    border-radius: 1px;
    margin: 0 4px;
}

.pin-box {
    width: 52px;
    height: 64px;
    font-family: var(--font-mono);
    font-size: 1.75rem;
    font-weight: 600;
    text-align: center;
    background-color: var(--bg-tertiary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    outline: none;
    transition: all var(--transition);
    caret-color: var(--accent-primary);
}

.pin-box:focus {
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px var(--accent-primary-alpha);
    background-color: var(--bg-secondary);
}

.pin-box.filled {
    border-color: var(--accent-primary);
    background-color: var(--accent-primary-bg);
}

.pin-box.error {
    border-color: var(--accent-danger);
    background-color: var(--accent-danger-bg);
    animation: shake 0.4s ease-in-out;
}

.pin-box.success {
    border-color: var(--accent-success);
    background-color: var(--accent-success-bg);
    animation: successPulse 0.3s ease-out;
}

.pin-box::placeholder {
    color: var(--text-muted);
    opacity: 0.4;
}

.pin-box::-webkit-outer-spin-button,
.pin-box::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

/* PIN animations */
@keyframes shake {
    0%, 100% { transform: translateX(0); }
    10%, 30%, 50%, 70%, 90% { transform: translateX(-4px); }
    20%, 40%, 60%, 80% { transform: translateX(4px); }
}

@keyframes successPulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); }
}

@keyframes fillIn {
    0% { transform: scale(0.8); opacity: 0.5; }
    100% { transform: scale(1); opacity: 1; }
}

.pin-box.animating {
    animation: fillIn 0.15s ease-out;
}

/* Attempts indicator */
.attempts-indicator {
    display: none;
    justify-content: center;
    margin-bottom: 1rem;
}

.attempts-indicator.visible {
    display: flex;
}

.attempts-dots {
    display: flex;
    gap: 6px;
}

.attempts-dots .dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: var(--border-color);
    transition: background-color var(--transition);
}

.attempts-dots .dot.used {
    background-color: var(--accent-danger);
}

/* Subtitle styling */
.subtitle {
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

/* Warning styling */
.warning {
    color: var(--accent-warning);
    font-size: 0.875rem;
    margin-top: 0.5rem;
}

.warning.hidden {
    display: none;
}

/* Error styling for PIN */
#code-error {
    margin-top: 0;
    margin-bottom: 0.75rem;
}

#attempts-warning {
    margin-top: 0;
    margin-bottom: 0.75rem;
}

/* Small spinner for button */
.spinner-small {
    display: inline-block;
    width: 14px;
    height: 14px;
    border: 2px solid var(--spinner-track);
    border-top-color: var(--bg-primary);
    border-radius: 50%;
    animation: spin 600ms linear infinite;
    margin-right: 6px;
    vertical-align: middle;
}

/* Buttons */
.btn {
    font-family: var(--font-sans);
    font-size: 0.9rem;
    font-weight: 500;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: background-color var(--transition), transform var(--transition);
}

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

.btn-primary {
    background-color: var(--accent-primary);
    color: var(--bg-primary);
}

.btn-primary:hover {
    background-color: var(--accent-primary-hover);
}

.btn-primary:focus-visible {
    outline: 2px solid var(--accent-primary);
    outline-offset: 2px;
}

/* Error message */
.error {
    color: var(--accent-danger);
    font-size: 0.875rem;
    margin-top: 0.5rem;
}

.error.hidden {
    display: none;
}

/* Content Display */
.content-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1rem;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.content-meta {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.content-actions {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.action-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 0.5rem 0.75rem;
    font-family: var(--font-sans);
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-secondary);
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition);
}

.action-btn:hover {
    color: var(--text-primary);
    background-color: var(--bg-secondary);
    border-color: var(--accent-primary);
}

.action-btn:active {
    transform: scale(0.96);
}

.action-btn.copied {
    color: var(--accent-success);
    border-color: var(--accent-success);
    background-color: var(--accent-success-bg);
}

.action-label {
    display: inline;
}

.badge {
    font-size: 0.75rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 0.25rem 0.5rem;
    background-color: var(--bg-tertiary);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
}

.burn-notice {
    font-size: 0.75rem;
    color: var(--accent-warning);
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.burn-notice.hidden {
    display: none;
}

.views-notice {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.views-notice.hidden {
    display: none;
}

/* Content body */
.content-body {
    position: relative;
}

/* Paste Content */
.paste-content {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    line-height: 1.7;
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1rem;
    overflow-x: auto;
    white-space: pre-wrap;
    word-wrap: break-word;
    max-height: 500px;
    overflow-y: auto;
    text-align: left;
}

.paste-content:empty {
    display: none;
}

/* File Download */
.file-download {
    display: block;
}

.file-download.hidden {
    display: none;
}

.file-card {
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 2rem;
    text-align: center;
}

.file-icon-large {
    color: var(--text-muted);
    margin-bottom: 1rem;
}

.file-icon-large svg {
    display: inline-block;
}

.file-name {
    font-weight: 600;
    font-size: 1rem;
    color: var(--text-primary);
    word-break: break-all;
    margin-bottom: 0.25rem;
}

.file-size {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-bottom: 1.25rem;
}

.btn-download {
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.btn-download svg {
    flex-shrink: 0;
}

/* Copy toast notification */
.copy-toast {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%) translateY(20px);
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 0.75rem 1.25rem;
    background-color: var(--accent-success);
    color: var(--bg-primary);
    font-size: 0.875rem;
    font-weight: 500;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow);
    opacity: 0;
    visibility: hidden;
    transition: all 0.2s ease;
    z-index: 1000;
}

.copy-toast.visible {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}

.copy-toast.hidden {
    opacity: 0;
    visibility: hidden;
    transform: translateX(-50%) translateY(20px);
}

/* Footer */
.footer {
    margin-top: 2rem;
    text-align: center;
}

.footer p {
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* Scrollbar */
.paste-content::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

.paste-content::-webkit-scrollbar-track {
    background: var(--bg-secondary);
    border-radius: var(--radius-sm);
}

.paste-content::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: var(--radius-sm);
}

.paste-content::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* Responsive */
@media (max-width: 480px) {
    .card {
        padding: 1.25rem;
    }

    .state h2 {
        font-size: 1.25rem;
    }

    /* PIN boxes responsive */
    .pin-container {
        gap: 6px;
    }

    .pin-box {
        width: 44px;
        height: 56px;
        font-size: 1.5rem;
    }

    .pin-separator {
        width: 8px;
        margin: 0 2px;
    }

    .paste-content {
        font-size: 0.8rem;
        max-height: 400px;
    }

    .file-card {
        padding: 1.5rem;
    }

    /* Content header stacking */
    .content-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .content-actions {
        width: 100%;
    }

    .action-btn {
        flex: 1;
        justify-content: center;
    }

    /* Copy toast */
    .copy-toast {
        bottom: 1rem;
        left: 1rem;
        right: 1rem;
        transform: translateX(0) translateY(20px);
        justify-content: center;
    }

    .copy-toast.visible {
        transform: translateX(0) translateY(0);
    }
}

/* Small phones */
@media (max-width: 360px) {
    .pin-box {
        width: 40px;
        height: 52px;
        font-size: 1.35rem;
    }

    .pin-separator {
        width: 6px;
        margin: 0;
    }

    .pin-container {
        gap: 4px;
    }
}

/* Tablet and up */
@media (min-width: 768px) {
    .pin-box {
        width: 56px;
        height: 68px;
        font-size: 2rem;
    }

    .pin-container {
        gap: 10px;
    }

    .pin-separator {
        width: 16px;
        margin: 0 6px;
    }
}