/* ===== CSS Reset & Base Styles ===== */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Color Palette - Monochromatic */
    --bg-primary: #050505;
    --bg-secondary: #0a0a0a;
    --bg-card: rgba(20, 20, 20, 0.6);
    --bg-card-hover: rgba(30, 30, 30, 0.8);

    --text-primary: #ffffff;
    --text-secondary: #a0a0a0;
    --text-muted: #606060;

    --accent-primary: #ffffff;
    --accent-secondary: #d4d4d4;
    --accent-tertiary: #a0a0a0;
    --accent-gradient: linear-gradient(135deg, #ffffff, #d4d4d4);

    --success: #ffffff;
    /* Success is white in mono with icon distinction */
    --error: #ff4444;
    /* Keep red for critical errors */
    --warning: #ffcc00;
    /* Keep yellow for warning */

    --border-color: rgba(255, 255, 255, 0.1);
    --border-hover: rgba(255, 255, 255, 0.2);

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 0.75rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;

    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.5);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.6);
    --shadow-glow: 0 0 20px rgba(255, 255, 255, 0.05);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 400ms ease;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
    overflow-x: hidden;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px),
        radial-gradient(circle at 50% 0%, rgba(255, 255, 255, 0.05) 0%, transparent 60%);
    background-size: 50px 50px, 50px 50px, 100% 100%;
    background-position: center top;
}

/* ===== Background Effects - REMOVED ===== */
.background-effects {
    display: none;
}

/* ===== Container ===== */
.container {
    position: relative;
    z-index: 1;
    max-width: 600px;
    margin: 0 auto;
    padding: var(--spacing-xl);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ===== Header ===== */
header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
}

.logo-icon {
    width: 48px;
    height: 48px;
    background: white;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-glow);
}

.logo-icon svg {
    width: 28px;
    height: 28px;
    color: black;
}

.logo h1 {
    font-size: 2rem;
    font-weight: 700;
    color: white;
    letter-spacing: -0.02em;
}

.tagline {
    color: var(--text-secondary);
    font-size: 1rem;
    font-weight: 400;
}

/* ===== Tabs ===== */
.tabs {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
    background: var(--bg-card);
    padding: var(--spacing-xs);
    border-radius: var(--radius-lg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
}

.tab-btn {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-md);
    background: transparent;
    border: none;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-family: inherit;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-normal);
}

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

.tab-btn:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.05);
}

.tab-btn.active {
    background: white;
    color: black;
    box-shadow: var(--shadow-glow);
}

/* ===== Main Content ===== */
main {
    flex: 1;
}

.tab-content {
    display: none;
    animation: fadeIn var(--transition-normal);
}

.tab-content.active {
    display: block;
}

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

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

/* ===== Card ===== */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    backdrop-filter: blur(20px);
    box-shadow: var(--shadow-lg);
}

/* ===== Upload Zone ===== */
.upload-zone {
    position: relative;
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-2xl);
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-normal);
    margin-bottom: var(--spacing-lg);
    overflow: hidden;
}

.upload-zone:hover {
    border-color: var(--accent-primary);
    background: rgba(255, 255, 255, 0.05);
}

.upload-zone.dragover {
    border-color: var(--accent-primary);
    background: rgba(255, 255, 255, 0.08);
    transform: scale(1.02);
}

.upload-zone.has-image {
    padding: 0;
    border-style: solid;
    border-color: var(--border-hover);
}

.upload-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
}

.upload-icon {
    width: 64px;
    height: 64px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-normal);
}

.upload-zone:hover .upload-icon {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-5px);
}

.upload-icon svg {
    width: 28px;
    height: 28px;
    color: var(--accent-primary);
}

.upload-text {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.browse-link {
    color: var(--accent-primary);
    font-weight: 500;
    text-decoration: underline;
    text-underline-offset: 2px;
}

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

/* ===== Image Preview ===== */
.image-preview {
    display: none;
    position: relative;
}

.upload-zone.has-image .upload-placeholder {
    display: none;
}

.upload-zone.has-image .image-preview {
    display: block;
}

.image-preview img {
    width: 100%;
    max-height: 300px;
    object-fit: contain;
    border-radius: var(--radius-md);
}

.remove-btn {
    position: absolute;
    top: var(--spacing-sm);
    right: var(--spacing-sm);
    width: 36px;
    height: 36px;
    background: rgba(0, 0, 0, 0.7);
    border: none;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-fast);
    backdrop-filter: blur(10px);
}

.remove-btn:hover {
    background: var(--error);
    transform: scale(1.1);
}

.remove-btn svg {
    width: 18px;
    height: 18px;
    color: white;
}

/* ===== Message Section ===== */
.message-section {
    margin-bottom: var(--spacing-lg);
}

.message-section label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-weight: 500;
    color: var(--text-primary);
}

.message-section textarea {
    width: 100%;
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    font-family: inherit;
    font-size: 0.95rem;
    color: var(--text-primary);
    resize: vertical;
    min-height: 120px;
    transition: all var(--transition-normal);
}

.message-section textarea:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.2);
}

.message-section textarea::placeholder {
    color: var(--text-muted);
}



/* ===== Action Button ===== */
.action-btn {
    width: 100%;
    padding: var(--spacing-md) var(--spacing-xl);
    background: var(--accent-primary);
    border: none;
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: 1rem;
    font-weight: 600;
    color: black;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
    box-shadow: 0 0 10px rgba(255, 255, 255, 0.1);
}

.action-btn::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(0, 0, 0, 0.1), transparent);
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.action-btn:hover::before {
    opacity: 1;
}

.action-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 20px rgba(255, 255, 255, 0.2);
}

.action-btn:active {
    transform: translateY(0);
}

.action-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.action-btn.loading .btn-text {
    visibility: hidden;
}

.action-btn.loading .btn-loader {
    display: block;
}

.btn-loader {
    display: none;
    position: absolute;
    width: 24px;
    height: 24px;
    border: 3px solid rgba(0, 0, 0, 0.1);
    border-top-color: black;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* ===== Result Section ===== */
.result-section {
    display: none;
    margin-top: var(--spacing-lg);
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    animation: slideUp var(--transition-normal);
}

.result-section.visible {
    display: block;
}

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

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

.result-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
    font-weight: 600;
}

.result-header svg {
    width: 24px;
    height: 24px;
}

.result-content {
    background: rgba(0, 0, 0, 0.3);
    border-radius: var(--radius-sm);
    padding: var(--spacing-md);
    font-size: 0.95rem;
    line-height: 1.6;
    word-break: break-word;
    max-height: 200px;
    overflow-y: auto;
}

.copy-btn {
    margin-top: var(--spacing-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    background: transparent;
    border: 1px solid var(--text-primary);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.copy-btn:hover {
    background: var(--text-primary);
    color: black;
}

.copy-btn svg {
    width: 16px;
    height: 16px;
}

/* ===== Footer ===== */
footer {
    text-align: center;
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
}

footer p {
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* ===== Toast Notifications ===== */
#toast-container {
    position: fixed;
    bottom: var(--spacing-xl);
    right: var(--spacing-xl);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    z-index: 1000;
}

.toast {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    backdrop-filter: blur(20px);
    box-shadow: var(--shadow-lg);
    animation: slideIn var(--transition-normal);
    min-width: 280px;
}

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

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

.toast-icon {
    width: 24px;
    height: 24px;
    flex-shrink: 0;
}

.toast.success .toast-icon {
    color: var(--success);
}

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

.toast-message {
    flex: 1;
    font-size: 0.9rem;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(100%);
    }

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

@keyframes slideOut {
    from {
        opacity: 1;
        transform: translateX(0);
    }

    to {
        opacity: 0;
        transform: translateX(100%);
    }
}

/* ===== Responsive Design ===== */
@media (max-width: 640px) {
    .container {
        padding: var(--spacing-md);
    }

    .logo h1 {
        font-size: 1.5rem;
    }

    .tab-btn {
        padding: var(--spacing-sm);
        font-size: 0.85rem;
    }

    .tab-btn svg {
        width: 18px;
        height: 18px;
    }

    .card {
        padding: var(--spacing-lg);
    }

    .upload-zone {
        padding: var(--spacing-xl);
    }


    #toast-container {
        left: var(--spacing-md);
        right: var(--spacing-md);
    }
}

/* ===== Input Group ===== */
.input-group {
    margin-bottom: var(--spacing-lg);
}

.input-group label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-weight: 500;
    color: var(--text-primary);
}

.password-input {
    width: 100%;
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    font-family: inherit;
    font-size: 0.95rem;
    color: var(--text-primary);
    transition: all var(--transition-normal);
}

.password-input:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.2);
}

.password-input::placeholder {
    color: var(--text-muted);
}