/* ===== CUSTOM PROPERTY FOR SMOOTH BORDER ROTATION ===== */
@property --border-angle {
    syntax: '<angle>';
    initial-value: 0deg;
    inherits: false;
}

/* ===== RESET & BASE ===== */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --bg: #363636;
    --bg-card: #2a2a2a;
    --bg-input: #404040;
    --text: #ffffff;
    --text-sub: #aaaaaa;
    --accent-1: #04FEF6;
    --accent-2: #05FFB4;
    --gradient: linear-gradient(135deg, var(--accent-1), var(--accent-2));
    --radius: 12px;
    --shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
}

body {
    background-color: var(--bg);
    color: var(--text);
    font-family: 'Outfit', sans-serif;
    min-height: 100vh;
    overflow-x: hidden;
}

/* ===== KEYFRAMES ===== */
@keyframes borderSpin {
    0% {
        --border-angle: 0deg;
    }

    100% {
        --border-angle: 360deg;
    }
}

@keyframes shimmer {
    0% {
        background-position: 200% center;
    }

    100% {
        background-position: -50% center;
    }
}

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

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

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

/* ===== HEADER ===== */
.header {
    text-align: center;
    padding: 40px 20px 20px;
    position: relative;
}

.header h1 {
    font-size: 2.4rem;
    font-weight: 700;
    letter-spacing: 6px;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-transform: uppercase;
}

.header p {
    color: var(--text-sub);
    margin-top: 6px;
    font-weight: 300;
    font-size: 0.95rem;
    letter-spacing: 2px;
}

/* ===== LANGUAGE SWITCHER ===== */
.lang-switcher {
    position: absolute;
    top: 20px;
    right: 20px;
    display: flex;
    gap: 4px;
    z-index: 10;
}

.lang-btn {
    padding: 6px 10px;
    font-family: 'Outfit', sans-serif;
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 1px;
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: 6px;
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-sub);
    cursor: pointer;
    transition: all 0.3s;
}

.lang-btn:hover {
    border-color: var(--accent-1);
    color: var(--text);
    background: rgba(4, 254, 246, 0.08);
}

.lang-btn.active {
    background: var(--gradient);
    color: var(--bg);
    border-color: transparent;
    font-weight: 700;
}

/* ===== LAYOUT ===== */
.container {
    max-width: 960px;
    margin: 0 auto;
    padding: 0 20px 60px;
}

/* ===== CARD ===== */
.card {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 28px;
    margin-bottom: 20px;
    position: relative;
    border: 1px solid transparent;
    background-clip: padding-box;
    box-shadow: var(--shadow);
}

.card::before {
    content: '';
    position: absolute;
    inset: -1px;
    border-radius: calc(var(--radius) + 1px);
    padding: 1px;
    background: var(--gradient);
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    pointer-events: none;
    opacity: 0.35;
    transition: opacity 0.3s;
}

.card:hover::before {
    opacity: 0.7;
}

.card-title {
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 3px;
    text-transform: uppercase;
    color: var(--text-sub);
    margin-bottom: 18px;
}

/* ===== UPLOAD ZONE ===== */
.upload-zone {
    border: 2px dashed rgba(255, 255, 255, 0.15);
    border-radius: var(--radius);
    padding: 48px 20px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s;
    position: relative;
    overflow: hidden;
}

.upload-zone:hover {
    border-color: var(--accent-1);
    background: rgba(4, 254, 246, 0.03);
}

.upload-zone.drag-over {
    border-color: var(--accent-2);
    background: rgba(5, 255, 180, 0.06);
}

.upload-zone.has-image {
    padding: 12px;
}

.upload-icon {
    font-size: 2.8rem;
    margin-bottom: 12px;
    display: block;
    opacity: 0.5;
}

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

.upload-text .click-text {
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 600;
}

.preview-img {
    max-width: 100%;
    max-height: 300px;
    border-radius: 8px;
    object-fit: contain;
    display: block;
    margin: 0 auto;
}

.change-hint {
    margin-top: 10px;
    font-size: 0.8rem;
    color: var(--text-sub);
    opacity: 0;
    transition: opacity 0.3s;
}

.upload-zone:hover .change-hint {
    opacity: 1;
}

/* ===== CONTROLS ===== */
.controls-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

@media (max-width: 600px) {
    .controls-grid {
        grid-template-columns: 1fr;
    }

    .lang-switcher {
        position: static;
        justify-content: center;
        margin-bottom: 10px;
    }

    .header {
        padding-top: 20px;
    }
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.control-label {
    font-size: 0.78rem;
    font-weight: 600;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--text-sub);
}

/* ===== MODE TOGGLE ===== */
.mode-toggle {
    display: flex;
    gap: 8px;
}

.mode-btn {
    flex: 1;
    padding: 12px 16px;
    background: transparent;
    border: none;
    color: var(--text-sub);
    font-family: 'Outfit', sans-serif;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    position: relative;
    letter-spacing: 1px;
    border-radius: 8px;
    z-index: 0;
    transition: color 0.3s;
}

/* Rotating gradient border */
.mode-btn::before {
    content: '';
    position: absolute;
    inset: -2px;
    border-radius: 10px;
    background: conic-gradient(from var(--border-angle), var(--accent-1), var(--accent-2), var(--accent-1));
    z-index: -2;
    opacity: 0.3;
    transition: opacity 0.4s;
}

/* Inner fill */
.mode-btn::after {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: 8px;
    background: var(--bg-input);
    z-index: -1;
    transition: all 0.3s;
}

.mode-btn:hover {
    color: var(--text);
}

.mode-btn:hover::before {
    animation: borderSpin 3s linear infinite;
    opacity: 1;
}

/* Active/selected state — filled with shimmer */
.mode-btn.active {
    color: var(--bg);
}

.mode-btn.active::before {
    opacity: 0.8;
}

.mode-btn.active:hover::before {
    animation: borderSpin 3s linear infinite;
    opacity: 1;
}

.mode-btn.active::after {
    background: linear-gradient(110deg,
            var(--accent-1) 0%,
            var(--accent-2) 35%,
            rgba(255, 255, 255, 0.35) 50%,
            var(--accent-1) 65%,
            var(--accent-2) 100%);
    background-size: 300% 100%;
}

.mode-btn.active:hover::after {
    animation: shimmer 2s ease-in-out infinite;
}

/* ===== COLOR PICKER ===== */
.color-picker-wrap {
    display: flex;
    align-items: center;
    gap: 10px;
    background: var(--bg-input);
    border-radius: 8px;
    padding: 6px 12px;
    border: 1px solid rgba(255, 255, 255, 0.08);
    transition: border-color 0.3s;
}

.color-picker-wrap:hover {
    border-color: rgba(255, 255, 255, 0.2);
}

.color-picker-wrap input[type="color"] {
    -webkit-appearance: none;
    appearance: none;
    border: none;
    width: 32px;
    height: 32px;
    border-radius: 6px;
    cursor: pointer;
    background: none;
    padding: 0;
}

.color-picker-wrap input[type="color"]::-webkit-color-swatch-wrapper {
    padding: 0;
}

.color-picker-wrap input[type="color"]::-webkit-color-swatch {
    border: 2px solid rgba(255, 255, 255, 0.15);
    border-radius: 6px;
}

.color-hex {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.85rem;
    color: var(--text);
    background: transparent;
    border: none;
    width: 80px;
    outline: none;
}

/* ===== WIDTH INPUT ===== */
.width-input-wrap {
    display: flex;
    align-items: center;
    gap: 10px;
    background: var(--bg-input);
    border-radius: 8px;
    padding: 6px 12px;
    border: 1px solid rgba(255, 255, 255, 0.08);
    transition: border-color 0.3s;
}

.width-input-wrap:hover {
    border-color: rgba(255, 255, 255, 0.2);
}

.width-input-wrap input[type="number"] {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.95rem;
    color: var(--text);
    background: transparent;
    border: none;
    width: 80px;
    outline: none;
    -moz-appearance: textfield;
    appearance: textfield;
}

.width-input-wrap input[type="number"]::-webkit-inner-spin-button,
.width-input-wrap input[type="number"]::-webkit-outer-spin-button {
    -webkit-appearance: none;
    appearance: none;
}

.width-unit {
    font-size: 0.8rem;
    color: var(--text-sub);
    letter-spacing: 1px;
}

/* ===== GENERATE BUTTON ===== */
.generate-btn {
    display: block;
    width: 100%;
    padding: 16px;
    margin-top: 24px;
    background: transparent;
    color: var(--bg);
    border: none;
    border-radius: var(--radius);
    font-family: 'Outfit', sans-serif;
    font-size: 1rem;
    font-weight: 700;
    letter-spacing: 3px;
    text-transform: uppercase;
    cursor: pointer;
    position: relative;
    z-index: 0;
    transition: all 0.3s;
    box-shadow: 0 0 0 rgba(4, 254, 246, 0);
}

/* Rotating border */
.generate-btn::before {
    content: '';
    position: absolute;
    inset: -2px;
    border-radius: calc(var(--radius) + 2px);
    background: conic-gradient(from var(--border-angle), var(--accent-1), var(--accent-2), var(--accent-1));
    z-index: -2;
    opacity: 0.5;
    transition: opacity 0.4s;
}

/* Inner fill with shimmer gradient */
.generate-btn::after {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: var(--radius);
    z-index: -1;
    background: linear-gradient(110deg,
            var(--accent-1) 0%,
            var(--accent-2) 35%,
            rgba(255, 255, 255, 0.35) 50%,
            var(--accent-1) 65%,
            var(--accent-2) 100%);
    background-size: 300% 100%;
    transition: all 0.3s;
}

.generate-btn:hover {
    box-shadow: 0 0 28px rgba(4, 254, 246, 0.35);
    transform: translateY(-1px);
}

.generate-btn:hover::before {
    animation: borderSpin 3s linear infinite;
    opacity: 1;
}

.generate-btn:hover::after {
    animation: shimmer 2s ease-in-out infinite;
}

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

.generate-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    box-shadow: none;
    transform: none;
}

.generate-btn:disabled:hover::before,
.generate-btn:disabled:hover::after {
    animation: none;
}

/* ===== RESULT ===== */
.result-card {
    display: none;
}

.result-card.visible {
    display: block;
    animation: fadeIn 0.4s ease;
}

.result-actions {
    display: flex;
    gap: 10px;
    margin-bottom: 16px;
    flex-wrap: wrap;
}

/* ===== ACTION BUTTONS ===== */
.action-btn {
    padding: 10px 20px;
    border-radius: 8px;
    background: transparent;
    color: var(--text);
    font-family: 'Outfit', sans-serif;
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 1px;
    cursor: pointer;
    transition: all 0.3s;
    border: none;
    position: relative;
    z-index: 0;
}

/* Rotating gradient border */
.action-btn::before {
    content: '';
    position: absolute;
    inset: -2px;
    border-radius: 10px;
    background: conic-gradient(from var(--border-angle), var(--accent-1), var(--accent-2), var(--accent-1));
    z-index: -2;
    opacity: 0.35;
    transition: opacity 0.4s;
}

/* Inner fill */
.action-btn::after {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: 8px;
    background: var(--bg-card);
    z-index: -1;
    transition: all 0.3s;
}

.action-btn:hover::before {
    animation: borderSpin 3s linear infinite;
    opacity: 1;
}

.action-btn:hover::after {
    background: rgba(4, 254, 246, 0.06);
}

.action-btn.copied {
    color: var(--bg);
}

.action-btn.copied::after {
    background: var(--gradient);
}

/* ===== RANGE SLIDER (SENSITIVITY) ===== */
input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    background: transparent;
}

input[type="range"]:focus {
    outline: none;
}

input[type="range"]::-webkit-slider-runnable-track {
    width: 100%;
    height: 6px;
    cursor: pointer;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 3px;
    transition: background 0.3s;
}

input[type="range"]:hover::-webkit-slider-runnable-track {
    background: rgba(4, 254, 246, 0.2);
}

input[type="range"]::-webkit-slider-thumb {
    height: 18px;
    width: 18px;
    border-radius: 50%;
    background: var(--accent-1);
    cursor: pointer;
    -webkit-appearance: none;
    margin-top: -6px;
    box-shadow: 0 0 10px rgba(4, 254, 246, 0.6);
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.3);
    background: var(--accent-2);
    box-shadow: 0 0 16px rgba(5, 255, 180, 0.8);
}

input[type="range"]::-webkit-slider-thumb:active {
    transform: scale(1.1);
}

/* For Firefox */
input[type="range"]::-moz-range-track {
    width: 100%;
    height: 6px;
    cursor: pointer;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 3px;
    transition: background 0.3s;
}

input[type="range"]:hover::-moz-range-track {
    background: rgba(4, 254, 246, 0.2);
}

input[type="range"]::-moz-range-thumb {
    height: 18px;
    width: 18px;
    border: none;
    border-radius: 50%;
    background: var(--accent-1);
    cursor: pointer;
    box-shadow: 0 0 10px rgba(4, 254, 246, 0.6);
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

input[type="range"]::-moz-range-thumb:hover {
    transform: scale(1.3);
    background: var(--accent-2);
    box-shadow: 0 0 16px rgba(5, 255, 180, 0.8);
}

/* ===== ASCII / DOT OUTPUT ===== */
.ascii-output {
    font-family: 'JetBrains Mono', 'Courier New', monospace;
    font-size: 5px;
    line-height: 5.5px;
    letter-spacing: 0.5px;
    white-space: pre;
    overflow-x: auto;
    padding: 16px;
    border-radius: 8px;
    display: inline-block;
    max-width: 100%;
}

.ascii-output.dot-mode {
    font-size: 8px;
    line-height: 1;
    letter-spacing: 0;
}

.result-wrap {
    overflow-x: auto;
    text-align: center;
    border-radius: 8px;
}

/* ===== LOADING ===== */
.loading-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(54, 54, 54, 0.85);
    z-index: 100;
    justify-content: center;
    align-items: center;
    backdrop-filter: blur(4px);
}

.loading-overlay.active {
    display: flex;
}

.spinner {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    border: 3px solid rgba(255, 255, 255, 0.1);
    border-top-color: var(--accent-1);
    animation: spin 0.8s linear infinite;
}

/* ===== TOAST ===== */
.toast {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%) translateY(80px);
    background: var(--bg-card);
    color: var(--text);
    padding: 12px 28px;
    border-radius: 8px;
    font-size: 0.9rem;
    box-shadow: var(--shadow);
    border: 1px solid rgba(4, 254, 246, 0.3);
    transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 200;
    pointer-events: none;
}

.toast.show {
    transform: translateX(-50%) translateY(0);
}

/* ===== SCROLLBAR ===== */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: var(--bg-card);
}

::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.15);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.3);
}