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

:root {
    --bg-primary: #0d1117;
    --bg-secondary: #161b22;
    --bg-tertiary: #21262d;
    --text-primary: #e6edf3;
    --text-secondary: #8b949e;
    --accent: #58a6ff;
    --accent-hover: #79c0ff;
    --success: #3fb950;
    --error: #f85149;
    --border: #30363d;
    --radius: 8px;
}

html {
    font-size: 16px;
}

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

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 1rem;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header */
header {
    padding: 1.5rem 0;
    border-bottom: 1px solid var(--border);
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
}

.logo:hover {
    color: var(--accent);
}

/* Main */
main {
    flex: 1;
    padding: 2rem 0;
}

/* Footer */
footer {
    padding: 1.5rem 0;
    border-top: 1px solid var(--border);
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* Upload area */
.upload-area {
    border: 2px dashed var(--border);
    border-radius: var(--radius);
    padding: 3rem 2rem;
    text-align: center;
    cursor: pointer;
    transition: border-color 0.2s, background-color 0.2s;
}

.upload-area:hover,
.upload-area.dragover {
    border-color: var(--accent);
    background-color: var(--bg-secondary);
}

.upload-icon {
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.upload-text {
    font-size: 1.125rem;
    margin-bottom: 0.5rem;
}

.upload-hint {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* Progress */
.progress {
    margin-top: 1.5rem;
}

.progress-bar {
    height: 4px;
    background-color: var(--accent);
    border-radius: 2px;
    width: 0%;
    transition: width 0.3s;
}

.progress-text {
    text-align: center;
    color: var(--text-secondary);
    margin-top: 0.5rem;
    font-size: 0.875rem;
}

/* Result */
.result {
    margin-top: 1.5rem;
    padding: 1.5rem;
    background-color: var(--bg-secondary);
    border-radius: var(--radius);
    border: 1px solid var(--border);
}

.result-label {
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
    font-size: 0.875rem;
}

.result-link-wrapper {
    display: flex;
    gap: 0.5rem;
}

.result-url {
    flex: 1;
    padding: 0.5rem 0.75rem;
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text-primary);
    font-size: 0.875rem;
    outline: none;
}

.result-url:focus {
    border-color: var(--accent);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.5rem 1rem;
    border: none;
    border-radius: var(--radius);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    text-decoration: none;
    text-align: center;
    transition: background-color 0.2s;
}

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

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

.btn-view {
    display: inline-block;
    margin-top: 0.75rem;
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border);
}

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

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

.btn-download:hover {
    opacity: 0.9;
}

.copy-feedback {
    color: var(--success);
    font-size: 0.875rem;
    margin-top: 0.5rem;
}

/* Error */
.error {
    margin-top: 1.5rem;
    padding: 1rem;
    background-color: rgba(248, 81, 73, 0.1);
    border: 1px solid var(--error);
    border-radius: var(--radius);
    color: var(--error);
}

/* View page */
.view-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
}

.view-image-wrapper {
    max-width: 100%;
    border-radius: var(--radius);
    overflow: hidden;
    border: 1px solid var(--border);
}

.view-image {
    display: block;
    max-width: 100%;
    height: auto;
    cursor: pointer;
}

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

/* Lightbox */
.lightbox-overlay {
    position: fixed;
    inset: 0;
    width: 100vw;
    height: 100vh;
    z-index: 1000;
    background: rgba(0, 0, 0, 0.9);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    box-sizing: border-box;
}

.lightbox-overlay[hidden] {
    display: none;
}

.lightbox-image {
    max-width: calc(100vw - 4rem);
    max-height: calc(100vh - 4rem);
    object-fit: contain;
    border-radius: var(--radius);
}

.lightbox-close {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 2rem;
    cursor: pointer;
    padding: 0.5rem;
    line-height: 1;
    opacity: 0.7;
    transition: opacity 0.2s;
}

.lightbox-close:hover {
    opacity: 1;
    background: transparent;
}

/* Paste toast */
.paste-toast {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    padding: 0.75rem 1.5rem;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text-primary);
    font-size: 0.875rem;
    z-index: 1100;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.paste-toast[hidden] {
    display: none;
}

.paste-toast.error {
    border-color: var(--error);
    color: var(--error);
}

/* Responsive */
@media (max-width: 600px) {
    .upload-area {
        padding: 2rem 1rem;
    }

    .result-link-wrapper {
        flex-direction: column;
    }

    .view-actions {
        flex-direction: column;
        width: 100%;
    }

    .view-actions .btn {
        width: 100%;
    }
}

/* Download split-button */
header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

.download-split {
    position: relative;
    display: inline-flex;
}

.download-split-main {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background-color: #238636;
    color: #ffffff;
    font-size: 0.875rem;
    font-weight: 500;
    text-decoration: none;
    border: 1px solid rgba(240, 246, 252, 0.1);
    border-right: none;
    border-radius: var(--radius) 0 0 var(--radius);
    cursor: pointer;
    transition: background-color 0.2s;
    white-space: nowrap;
}

.download-split-main:hover {
    background-color: #2ea043;
}

.download-split-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.5rem 0.5rem;
    background-color: #238636;
    color: #ffffff;
    border: 1px solid rgba(240, 246, 252, 0.1);
    border-left: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 0 var(--radius) var(--radius) 0;
    cursor: pointer;
    transition: background-color 0.2s;
}

.download-split-toggle:hover {
    background-color: #2ea043;
}

.download-dropdown {
    display: none;
    position: absolute;
    top: calc(100% + 4px);
    right: 0;
    min-width: 220px;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
    z-index: 100;
    overflow: hidden;
}

.download-dropdown.show {
    display: block;
}

.download-dropdown-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 0.625rem 1rem;
    color: var(--text-primary);
    text-decoration: none;
    font-size: 0.875rem;
    cursor: pointer;
    transition: background-color 0.15s;
}

.download-dropdown-item:hover {
    background-color: var(--bg-tertiary);
}

.download-dropdown-label {
    white-space: nowrap;
}

.download-dropdown-size {
    color: var(--text-secondary);
    font-size: 0.75rem;
    white-space: nowrap;
}

@media (max-width: 600px) {
    .download-split-main {
        padding: 0.4rem 0.75rem;
        font-size: 0.8125rem;
    }

    .download-split-toggle {
        padding: 0.4rem 0.4rem;
    }
}