@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;800&family=JetBrains+Mono:wght@700&display=swap');

:root {
    --primary-gradient: linear-gradient(135deg, #10b981 0%, #3b82f6 100%);
    --bg-color: #0f172a;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --card-bg: rgba(30, 41, 59, 0.7);
    --panel-bg: rgba(22, 32, 50, 0.7);
    --border-color: rgba(255, 255, 255, 0.06);
    --glass-blur: 20px;
    --accent: #10b981;
    --primary-color: #3b82f6;
    --cyan: #06b6d4;
    --input-bg: rgba(0, 0, 0, 0.3);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Outfit', sans-serif;
}

body {
    background: var(--bg-color);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 40px 20px;
    overflow-x: hidden;
}

.bg-blobs {
    position: absolute;
    width: 100%;
    height: 100%;
    z-index: -1;
    overflow: hidden;
    top: 0;
    left: 0;
}

.blob {
    position: absolute;
    width: 600px;
    height: 600px;
    background: var(--primary-gradient);
    filter: blur(80px);
    border-radius: 50%;
    opacity: 0.12;
}

.blob-1 {
    top: -10%;
    right: -10%;
}

.blob-2 {
    bottom: -10%;
    left: -10%;
}

.calculator-card {
    background: var(--card-bg);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    border: 1px solid var(--border-color);
    border-radius: 24px;
    padding: 40px;
    width: 100%;
    max-width: 900px;
    box-shadow: 0 30px 60px rgba(0, 0, 0, 0.4);
    display: flex;
    flex-direction: column;
    gap: 30px;
}

header {
    text-align: center;
}

header h1 {
    font-size: 2.2rem;
    font-weight: 800;
    color: var(--cyan);
    margin-bottom: 5px;
}

header p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.mode-tabs {
    display: flex;
    gap: 10px;
    background: var(--panel-bg);
    padding: 6px;
    border-radius: 14px;
    border: 1px solid var(--border-color);
    margin-bottom: 5px;
}

.tab-btn {
    flex: 1;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    padding: 12px;
    border-radius: 10px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.3s ease;
}

.tab-btn.active {
    background: var(--primary-gradient);
    color: white;
    box-shadow: 0 4px 12px rgba(16, 185, 129, 0.2);
}

.panel-row {
    display: flex;
    gap: 40px;
    align-items: flex-start;
}

.panel-left {
    flex: 1.2;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.input-section {
    display: none;
    flex-direction: column;
    gap: 15px;
    background: var(--panel-bg);
    padding: 20px;
    border-radius: 16px;
    border: 1px solid var(--border-color);
    animation: fadeIn 0.3s ease forwards;
}

.input-section.active {
    display: flex;
}

.input-section h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    border-bottom: 2px solid var(--accent);
    width: fit-content;
    padding-bottom: 4px;
    margin-bottom: 5px;
}

.grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
}

.grid-3 {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 15px;
}

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

.input-group label {
    color: var(--text-secondary);
    font-size: 0.85rem;
    font-weight: 500;
}

input,
select {
    background: var(--input-bg);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 12px;
    color: white;
    font-size: 0.95rem;
    outline: none;
    transition: all 0.3s ease;
}

input:focus,
select:focus {
    border-color: var(--accent);
    background: rgba(0, 0, 0, 0.4);
}

.color-picker-group {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
}

.color-picker-group div {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.color-picker-group input {
    width: 100%;
    height: 45px;
    cursor: pointer;
    padding: 5px;
}

.button-group {
    display: flex;
    gap: 15px;
    margin-top: 10px;
}

.primary-btn,
.secondary-btn,
.icon-btn {
    border: none;
    border-radius: 12px;
    padding: 14px 24px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.primary-btn {
    background: var(--primary-gradient);
    color: white;
    flex: 2;
    box-shadow: 0 10px 20px rgba(16, 185, 129, 0.2);
}

.primary-btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 15px 30px rgba(16, 185, 129, 0.3);
}

.secondary-btn {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    flex: 1;
}

.secondary-btn:hover {
    background: rgba(255, 255, 255, 0.1);
}

.primary-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Sticky Output Styles */
.output-panel {
    flex: 1;
    position: sticky;
    top: 30px;
    background: var(--card-bg);
    backdrop-filter: blur(var(--glass-blur));
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 25px;
    display: flex;
    flex-direction: column;
    gap: 20px;
    align-self: flex-start;
    min-width: 380px;
}

.preview-header {
    text-align: center;
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 2px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.preview-header i {
    color: var(--accent);
}

/* --- Timer Visual Styles --- */

.timer-display-wrapper {
    display: flex;
    justify-content: center;
    gap: 10px;
    padding: 40px 0;
    perspective: 1000px;
}

/* Flip Style */
.unit-block {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
}

.flip-card {
    position: relative;
    width: 70px;
    height: 100px;
    line-height: 100px;
    text-align: center;
    background: #333;
    border-radius: 8px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 4rem;
    color: #ccc;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.5);
}

.flip-card::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 0;
    width: 100%;
    height: 2px;
    background: rgba(0, 0, 0, 0.2);
    z-index: 10;
}

.unit-label {
    font-size: 0.75rem;
    text-transform: uppercase;
    color: var(--text-secondary);
    letter-spacing: 1px;
    font-weight: 700;
}

/* Block Style */
.block-style .flip-card {
    width: 60px;
    height: 80px;
    line-height: 80px;
    font-size: 3rem;
    box-shadow: none;
    border-radius: 12px;
    background: var(--panel-bg);
    border: 1px solid var(--border-color);
}

/* Circle Style */
.circle-style {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    justify-content: center;
}

.circle-unit {
    position: relative;
    width: 100px;
    height: 100px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.circle-unit svg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    transform: rotate(-90deg);
}

.circle-unit circle {
    fill: none;
    stroke-width: 6;
    stroke-linecap: round;
}

.circle-bg {
    stroke: rgba(255, 255, 255, 0.05);
}

.circle-progress {
    stroke: var(--accent);
    stroke-dasharray: 283;
    /* 2 * PI * 45 */
    stroke-dashoffset: 0;
    transition: stroke-dashoffset 1s linear;
}

.circle-val {
    font-family: 'JetBrains Mono', monospace;
    font-size: 1.8rem;
    font-weight: 700;
    z-index: 1;
}

.circle-label {
    font-size: 0.6rem;
    text-transform: uppercase;
    font-weight: 800;
    color: var(--text-secondary);
    margin-top: 5px;
    z-index: 1;
}

/* Controls */
.timer-controls {
    display: flex;
    justify-content: center;
    gap: 20px;
}

.icon-btn {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0;
}

#btn-pause:not(:disabled):hover {
    color: var(--accent);
    background: rgba(16, 185, 129, 0.1);
}

#btn-stop:not(:disabled):hover {
    color: #f43f5e;
    background: rgba(244, 63, 94, 0.1);
}

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

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

@media (max-width: 900px) {
    .panel-row {
        flex-direction: column;
    }

    .output-panel {
        width: 100%;
        min-width: unset;
        position: static;
    }

    .calculator-card {
        padding: 25px;
    }
}

@media (max-width: 480px) {
    .timer-display-wrapper {
        gap: 5px;
    }

    .flip-card {
        width: 50px;
        height: 70px;
        font-size: 2.5rem;
        line-height: 70px;
    }

    .circle-unit {
        width: 80px;
        height: 80px;
    }

    .circle-val {
        font-size: 1.4rem;
    }
}