/* Import Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

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

:root {
    /* Color Palette */
    --primary: #FF2E63;
    --primary-hover: #E01E53;
    --secondary: #8b5cf6;
    --accent: #ec4899;
    --success: #00FFC2;
    --error: #FF6B6B;
    --warning: #FFD23F;

    /* Neutrals */
    --bg-dark: #0f172a;
    --bg-card: #1e293b;
    --bg-input: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --border: #475569;

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #FF2E63 0%, #FF6B6B 100%);
    --gradient-accent: linear-gradient(135deg, #ec4899 0%, #f59e0b 100%);
    --gradient-success: linear-gradient(135deg, #00FFC2 0%, #14b8a6 100%);

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.4);
    --shadow-glow: 0 0 20px rgba(255, 46, 99, 0.3);
    --shadow-neopop: 4px 4px 0 rgba(255, 46, 99, 0.3);

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;

    /* Border Radius - Squircle Style */
    --radius-sm: 0.5rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    --radius-xl: 1.25rem;
    --radius-squircle: 10px;

    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-base: 250ms ease-in-out;
    --transition-slow: 350ms ease-in-out;
}

/* Light Mode */
body.light-mode {
    --bg-dark: #FFFFFF;
    --bg-card: #F8F9FA;
    --bg-input: #F5F5F5;
    --text-primary: #1A1A1A;
    --text-secondary: #6C757D;
    --border: #DEE2E6;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.15);
    --shadow-glow: 0 0 20px rgba(255, 46, 99, 0.25);
    --shadow-neopop: 4px 4px 0 rgba(255, 46, 99, 0.25);
}

body.light-mode::before {
    background:
        radial-gradient(circle at 20% 50%, rgba(255, 46, 99, 0.05) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(139, 92, 246, 0.05) 0%, transparent 50%),
        radial-gradient(circle at 40% 20%, rgba(236, 72, 153, 0.03) 0%, transparent 50%);
}

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

/* Animated Background */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background:
        radial-gradient(circle at 20% 50%, rgba(99, 102, 241, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(139, 92, 246, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 40% 20%, rgba(236, 72, 153, 0.05) 0%, transparent 50%);
    pointer-events: none;
    z-index: 0;
}

.container {
    position: relative;
    width: 100%;
    max-width: 100%;
    margin: 0;
    padding: var(--spacing-md) 0;
    z-index: 1;
}

/* Header */
.header {
    text-align: center;
    margin-bottom: var(--spacing-md);
    animation: fadeInDown 0.6s ease-out;
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: 1200px;
    margin: 0 auto var(--spacing-sm);
    padding: 0 var(--spacing-md);
}

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

.logo-icon {
    font-size: 2.5rem;
    animation: bounce 2s infinite;
}

.header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.025em;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.125rem;
    font-weight: 500;
}

/* Theme Toggle */
.theme-toggle {
    background: var(--bg-card);
    border: 2px solid var(--primary);
    color: var(--text-primary);
    width: 3rem;
    height: 3rem;
    border-radius: var(--radius-squircle);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    transition: var(--transition-base);
    box-shadow: var(--shadow-neopop);
    position: relative;
}

.theme-toggle:hover {
    transform: translate(2px, 2px);
    box-shadow: 2px 2px 0 rgba(255, 46, 99, 0.3);
}

.theme-toggle:active {
    transform: translate(4px, 4px);
    box-shadow: none;
}

/* Converter Layout */
.converter {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    animation: fadeIn 0.8s ease-out;
}

/* Sections */
.input-section,
.output-section {
    background: var(--bg-card);
    border-radius: var(--radius-squircle);
    padding: var(--spacing-md);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border);
    transition: all var(--transition-base);
}

.input-section:hover,
.output-section:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
    border-color: var(--primary);
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-sm);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.section-header h2 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
}

/* Format Selector */
.format-selector-wrapper {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.format-label {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    white-space: nowrap;
}

.format-selector {
    background: var(--bg-input);
    color: var(--text-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius-squircle);
    padding: 0.4rem 0.75rem;
    font-size: 0.9375rem;
    font-weight: 600;
    font-family: 'Inter', sans-serif;
    cursor: pointer;
    transition: all var(--transition-base);
}

.format-selector:hover {
    border-color: var(--primary);
}

.format-selector:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}

.token-count {
    background: var(--gradient-primary);
    color: var(--text-primary);
    padding: 0.375rem 0.875rem;
    border-radius: var(--radius-squircle);
    font-size: 0.875rem;
    font-weight: 600;
    box-shadow: var(--shadow-sm);
}

/* Code Editor with Line Numbers */
.code-editor {
    display: flex;
    gap: 0;
    position: relative;
    border: 1px solid var(--border);
    border-radius: var(--radius-squircle);
    background: var(--bg-dark);
    overflow: hidden;
    transition: all var(--transition-base);
    flex: 1;
    min-height: 500px;
}

/* Input section editor - 80% height when not fullscreen */
.input-section:not(.fullscreen) .code-editor {
    height: 80vh;
    max-height: 80vh;
    overflow: hidden;
    display: flex;
    flex-direction: row;
}

.input-section:not(.fullscreen) .input-area {
    flex: 1;
    overflow-y: auto;
    overflow-x: auto;
    height: 100%;
    resize: none;
}

.input-section:not(.fullscreen) .line-numbers {
    overflow-y: auto;
    overflow-x: hidden;
    height: 100%;
}

.input-section:not(.fullscreen) .line-numbers {
    overflow-y: hidden;
    overflow-x: hidden;
}

.code-editor:focus-within {
    border-color: var(--primary);
    box-shadow: 0 0 0 2px rgba(255, 46, 99, 0.15);
}

body.light-mode .code-editor {
    background: #FAFAFA;
}

body.light-mode .code-editor:focus-within {
    box-shadow: 0 0 0 2px rgba(255, 46, 99, 0.1);
}

.code-editor.error {
    border: 1px solid var(--error);
    animation: shake 0.5s ease-in-out;
}

.line-numbers {
    flex-shrink: 0;
    width: 3.5rem;
    padding: var(--spacing-md) 0;
    background: var(--bg-input);
    color: var(--text-secondary);
    font-family: 'Fira Code', 'Courier New', monospace;
    font-size: 0.8rem;
    line-height: 1.6;
    text-align: right;
    user-select: none;
    border-right: 1px solid var(--border);
    overflow: hidden;
    white-space: pre !important;
    padding-right: 0.75rem;
    opacity: 0.7;
}

body.light-mode .line-numbers {
    background: #F5F5F5;
}

.code-editor .input-area,
.code-editor .output-area {
    flex: 1;
    border: none;
    border-radius: 0;
    margin: 0;
}

.code-editor .input-area:focus,
.code-editor .output-area:focus {
    border: none;
    box-shadow: none;
}

/* Textarea Styles */
.input-area,
.output-area {
    width: 100%;
    min-height: 500px;
    background: transparent;
    border: none;
    border-radius: var(--radius-squircle);
    padding: var(--spacing-md);
    font-family: 'Fira Code', 'Courier New', monospace;
    font-size: 0.85rem;
    line-height: 1.6;
    color: var(--text-primary);
    resize: none;
    white-space: pre;
    overflow-x: auto;
    transition: all var(--transition-base);
}

.input-area:focus,
.output-area:focus {
    outline: none;
}


/* Error Display */
.error-display {
    margin-top: var(--spacing-md);
    background: rgba(239, 68, 68, 0.05);
    border: 1px solid var(--error);
    border-radius: var(--radius-squircle);
    padding: var(--spacing-md);
    display: flex;
    gap: var(--spacing-md);
    animation: slideInUp 0.3s ease-out;
}

.error-display.hidden {
    display: none;
}

.error-icon {
    font-size: 2rem;
    flex-shrink: 0;
}

.error-content {
    flex: 1;
}

.error-title {
    font-weight: 600;
    color: var(--error);
    margin-bottom: var(--spacing-xs);
    font-size: 1.125rem;
}

.error-message {
    color: var(--text-primary);
    font-family: 'Fira Code', monospace;
    font-size: 0.9375rem;
    margin-bottom: var(--spacing-xs);
    background: var(--bg-input);
    padding: var(--spacing-sm);
    border-radius: var(--radius-sm);
}

.error-tip {
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-style: italic;
}

/* Savings Display */
.savings-display {
    margin-top: var(--spacing-md);
    background: var(--gradient-success);
    border-radius: var(--radius-squircle);
    padding: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    color: var(--text-primary);
    animation: slideInUp 0.3s ease-out;
    box-shadow: var(--shadow-neopop), var(--shadow-glow);
    border: 2px solid var(--success);
}

.savings-display.hidden {
    display: none;
}

.savings-icon {
    font-size: 2rem;
    animation: pulse 2s infinite;
}

.savings-text {
    font-weight: 500;
    font-size: 1.125rem;
}

.savings-number,
.savings-percent {
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--text-primary);
}

/* Controls */
.controls {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    align-self: center;
}

.btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: 0.875rem 1.5rem;
    border: 2px solid transparent;
    border-radius: var(--radius-squircle);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-base);
    box-shadow: var(--shadow-neopop);
    white-space: nowrap;
    position: relative;
}

.btn-icon {
    font-size: 1.25rem;
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--text-primary);
    border-color: var(--primary);
}

.btn-primary:hover {
    transform: translate(2px, 2px);
    box-shadow: 2px 2px 0 rgba(255, 46, 99, 0.3), 0 0 20px rgba(255, 46, 99, 0.4);
}

.btn-primary:active {
    transform: translate(4px, 4px);
    box-shadow: none;
}

.btn-secondary {
    background: var(--gradient-accent);
    color: var(--text-primary);
    border-color: var(--accent);
    box-shadow: 4px 4px 0 rgba(236, 72, 153, 0.3);
}

.btn-secondary:hover {
    transform: translate(2px, 2px);
    box-shadow: 2px 2px 0 rgba(236, 72, 153, 0.3), 0 0 20px rgba(236, 72, 153, 0.4);
}

.btn-secondary:active {
    transform: translate(4px, 4px);
    box-shadow: none;
}

.btn-clear {
    background: var(--bg-card);
    color: var(--text-secondary);
    border: 2px solid var(--border);
    box-shadow: 4px 4px 0 rgba(71, 85, 105, 0.3);
}

.btn-clear:hover {
    transform: translate(2px, 2px);
    box-shadow: 2px 2px 0 rgba(71, 85, 105, 0.3);
}

.btn-clear:active {
    transform: translate(4px, 4px);
    box-shadow: none;
}

/* Copy Button */
.btn-icon-only {
    background: transparent;
    border: 1px solid var(--border);
    border-radius: var(--radius-squircle);
    padding: 0.5rem;
    cursor: pointer;
    transition: all var(--transition-base);
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-icon-only:hover {
    background: var(--bg-input);
    border-color: var(--primary);
    transform: scale(1.05);
}

.btn-icon-only:active {
    transform: scale(0.95);
}

.copy-icon {
    font-size: 1.25rem;
}

.btn-icon-only.copied {
    background: var(--success);
    border-color: var(--success);
}

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

.btn-text {
    background: var(--bg-input);
    border: 1px solid var(--border);
    color: var(--text-primary);
    font-size: 0.75rem;
    font-weight: 600;
    cursor: pointer;
    padding: 0.25rem 0.625rem;
    border-radius: var(--radius-sm);
    transition: all var(--transition-base);
    margin-right: var(--spacing-xs);
}

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

/* Feature Cards */
.features {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    padding: 0;
}

.feature {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-squircle);
    padding: var(--spacing-sm) var(--spacing-md);
    text-align: center;
    transition: all var(--transition-base);
    flex: 1;
    max-width: 300px;
}

.feature:hover {
    background: var(--bg-card);
    border-color: var(--primary);
}

.feature-icon {
    font-size: 1.25rem;
    margin-bottom: 2px;
}

.feature-title {
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 0;
    color: var(--text-primary);
}

.feature-desc {
    color: var(--text-secondary);
    font-size: 0.75rem;
}

/* Footer */
.footer {
    text-align: center;
    padding: var(--spacing-xl) 0;
    border-top: 1px solid var(--border);
    margin-top: var(--spacing-xl);
}

.attribution {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
}

.heart {
    color: var(--error);
    animation: heartbeat 1.5s infinite;
    display: inline-block;
}

.attribution strong {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 700;
}

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

.footer-links {
    margin: var(--spacing-xs) 0;
}

.footer-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.875rem;
    transition: color var(--transition-base);
}

.footer-link:hover {
    color: var(--primary);
    text-decoration: underline;
}

/* Advertisement Containers */
.ad-container {
    position: relative;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-squircle);
    padding: var(--spacing-xs);
    text-align: center;
    overflow: hidden;
}

.ad-label {
    font-size: 0.625rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.25rem;
    font-weight: 500;
}

.ad-horizontal {
    margin-bottom: var(--spacing-xs);
    min-height: 90px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.ad-bottom {
    margin: var(--spacing-lg) auto;
    max-width: 728px;
    min-height: 90px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.ad-vertical {
    min-height: 200px;
    min-width: 140px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

/* Control Buttons Wrapper */
.control-buttons {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

/* Suggestions Display */
.suggestions-display {
    margin-top: var(--spacing-md);
    background: rgba(245, 158, 11, 0.05);
    border: 1px solid var(--warning);
    border-radius: var(--radius-squircle);
    padding: var(--spacing-md);
    display: flex;
    gap: var(--spacing-md);
    animation: slideInUp 0.3s ease-out;
}

.suggestions-display.hidden {
    display: none;
}

.suggestions-icon {
    font-size: 2rem;
    flex-shrink: 0;
}

.suggestions-content {
    flex: 1;
}

.suggestions-title {
    font-weight: 600;
    color: var(--warning);
    margin-bottom: var(--spacing-xs);
    font-size: 1.125rem;
}

.suggestions-message {
    color: var(--text-primary);
    font-size: 0.9375rem;
    margin-bottom: var(--spacing-sm);
}

.suggestions-list {
    list-style: none;
    padding-left: 0;
}

.suggestions-list li {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-bottom: var(--spacing-xs);
    padding-left: var(--spacing-md);
    position: relative;
}

.suggestions-list li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--warning);
    font-weight: bold;
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

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

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

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

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

@keyframes shake {

    0%,
    100% {
        transform: translateX(0);
    }

    25% {
        transform: translateX(-5px);
    }

    75% {
        transform: translateX(5px);
    }
}

@keyframes bounce {

    0%,
    100% {
        transform: translateY(0);
    }

    50% {
        transform: translateY(-10px);
    }
}

@keyframes pulse {

    0%,
    100% {
        transform: scale(1);
    }

    50% {
        transform: scale(1.1);
    }
}

@keyframes heartbeat {

    0%,
    100% {
        transform: scale(1);
    }

    25% {
        transform: scale(1.2);
    }

    40% {
        transform: scale(1);
    }

    60% {
        transform: scale(1.1);
    }
}

/* Responsive Design */
@media (max-width: 1024px) {
    .converter {
        grid-template-columns: 1fr;
    }

    .controls {
        flex-direction: row;
        justify-content: center;
        flex-wrap: wrap;
    }

    .ad-vertical {
        min-width: 300px;
        min-height: 250px;
    }
}

@media (max-width: 768px) {
    .container {
        padding: var(--spacing-md) var(--spacing-sm);
    }

    .header h1 {
        font-size: 2rem;
    }

    .subtitle {
        font-size: 1rem;
    }

    .controls {
        flex-direction: column;
    }

    .control-buttons {
        width: 100%;
    }

    .btn {
        width: 100%;
    }

    .input-area,
    .output-area {
        min-height: 300px;
        font-size: 0.875rem;
    }

    .ad-horizontal {
        min-height: 100px;
    }

    .ad-vertical {
        min-height: 100px;
        min-width: 100%;
        margin-top: var(--spacing-md);
    }
}

@media (max-width: 480px) {
    .header h1 {
        font-size: 1.75rem;
    }

    .features {
        grid-template-columns: 1fr;
    }

    .ad-horizontal {
        min-height: 50px;
    }
}