/* ===== CSS Variables ===== */
:root {
    --font-family-mono: 'JetBrains Mono', monospace;
    --font-family-regular: 'Rubik', sans-serif;
    --radius: 8px;
    --radius-sm: 6px;
    --transition: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="light"] {
    --bg-primary: #f6f7fb;
    --bg-secondary: #ffffff;
    --bg-tertiary: #f2f4fa;
    --bg-input: #eef1f8;
    --bg-hover: #e7ebf5;
    --text-primary: #141824;
    --text-secondary: #4f5c76;
    --text-tertiary: #7b869d;
    --accent: #4a67ff;
    --accent-hover: #3b57eb;
    --accent-soft: rgba(74, 103, 255, 0.12);
    --accent-glow: rgba(74, 103, 255, 0.22);
    --border: #dfe3ee;
    --shadow-sm: 0 2px 10px rgba(20, 24, 36, 0.06);
    --shadow-md: 0 10px 30px rgba(20, 24, 36, 0.09);
    --shadow-lg: 0 24px 60px rgba(20, 24, 36, 0.12);
    --positive: #22c55e;
    --positive-soft: rgba(34, 197, 94, 0.14);
    --warning: #d59a18;
    --warning-soft: rgba(213, 154, 24, 0.14);
    --danger: #e25252;
    --danger-soft: rgba(226, 82, 82, 0.13);
    --sun-color: #f5a524;
    --moon-color: #7280a3;
    --girly-color: #d062b8;
    --card-top-glow: rgba(255, 255, 255, 0.85);
    --card-hover-border: #cfd7ea;
    --inset-stroke: rgba(255, 255, 255, 0.52);
}

[data-theme="dark"] {
    --bg-primary: #0b1020;
    --bg-secondary: #131a2e;
    --bg-tertiary: #1a2340;
    --bg-input: #1a2340;
    --bg-hover: #243056;
    --text-primary: #edf2ff;
    --text-secondary: #a7b2cc;
    --text-tertiary: #7483a8;
    --accent: #6e8cff;
    --accent-hover: #89a0ff;
    --accent-soft: rgba(110, 140, 255, 0.14);
    --accent-glow: rgba(110, 140, 255, 0.24);
    --border: #2b3860;
    --shadow-sm: 0 2px 10px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 12px 34px rgba(0, 0, 0, 0.42);
    --shadow-lg: 0 24px 64px rgba(0, 0, 0, 0.55);
    --positive: #34d399;
    --positive-soft: rgba(52, 211, 153, 0.15);
    --warning: #f1c15b;
    --warning-soft: rgba(241, 193, 91, 0.14);
    --danger: #f07c82;
    --danger-soft: rgba(240, 124, 130, 0.14);
    --sun-color: #7b89ab;
    --moon-color: #61dafb;
    --girly-color: #cf8dcb;
    --card-top-glow: rgba(255, 255, 255, 0.06);
    --card-hover-border: #3c4f84;
    --inset-stroke: rgba(255, 255, 255, 0.04);
}

[data-theme="girly"] {
    --bg-primary: #fff3fa;
    --bg-secondary: #ffffff;
    --bg-tertiary: #ffe6f5;
    --bg-input: #ffeaf7;
    --bg-hover: #ffd9ef;
    --text-primary: #3b2240;
    --text-secondary: #7e4d82;
    --text-tertiary: #a070a6;
    --accent: #e35dbf;
    --accent-hover: #cf4eac;
    --accent-soft: rgba(227, 93, 191, 0.16);
    --accent-glow: rgba(227, 93, 191, 0.26);
    --border: #f0c5e3;
    --shadow-sm: 0 2px 10px rgba(150, 45, 116, 0.08);
    --shadow-md: 0 10px 30px rgba(150, 45, 116, 0.12);
    --shadow-lg: 0 24px 60px rgba(150, 45, 116, 0.16);
    --positive: #2fbf92;
    --positive-soft: rgba(47, 191, 146, 0.14);
    --warning: #d79228;
    --warning-soft: rgba(215, 146, 40, 0.14);
    --danger: #e1578d;
    --danger-soft: rgba(225, 87, 141, 0.14);
    --sun-color: #f5a524;
    --moon-color: #8d80b0;
    --girly-color: #d54caf;
    --card-top-glow: rgba(255, 255, 255, 0.92);
    --card-hover-border: #e7add8;
    --inset-stroke: rgba(255, 255, 255, 0.6);
}

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

html,
body {
    min-height: 100%;
}

body {
    font-family: var(--font-family-regular);
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-y: auto;
    transition: background var(--transition), color var(--transition);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

body.desktop-no-scroll {
    overflow-y: hidden;
}

/* ===== Layout ===== */
.app {
    max-width: 520px;
    margin: 0 auto;
    padding: 24px 16px 48px;
}

/* ===== Icons ===== */
.ico-32 {
    font-size: 32px;    
}

.ico-24 {
    font-size: 24px;    
}

.ico-20 {
    font-size: 20px;    
}

.ico-16 {
    font-size: 16px;    
}

/* ===== Header ===== */
.header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 32px;
    padding: 0 4px;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 14px;
}

.logo-icon {
    width: 44px;
    height: 44px;
    background: var(--accent);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 20px;
    box-shadow: 0 4px 12px var(--accent-glow);
}

.header-title h1 {
    font-size: 22px;
    font-weight: 700;
    letter-spacing: -0.3px;
}

.header-title p {
    font-size: 14px;
    color: var(--text-secondary);
    font-weight: 500;
}

/* ===== Theme Toggle ===== */
.theme-toggle {
    position: relative;
    width: 120px;
    height: 40px;
    border-radius: 40px;
    background: linear-gradient(180deg, var(--bg-tertiary), var(--bg-input));
    border: 1px solid var(--border);
    cursor: pointer;
    transition: all var(--transition);
    overflow: hidden;
    padding: 0;
    outline: none;
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.06);
}

.theme-toggle:hover {
    border-color: var(--accent);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.08), 0 0 0 3px var(--accent-soft);
}

.toggle-thumb {
    position: absolute;
    top: 4px;
    left: 4px;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--accent);
    border: 1px solid rgba(255, 255, 255, 0.28);
    transition: transform var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 16px var(--accent-glow);
}

[data-theme="dark"] .toggle-thumb {
    transform: translateX(40px);
}

[data-theme="girly"] .toggle-thumb {
    transform: translateX(80px);
}

.toggle-icon {
    position: absolute;
    top: 50%;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    transform: translateY(-50%);
    transition: opacity var(--transition), color var(--transition), transform var(--transition);
    pointer-events: none;
    opacity: 0.55;
    z-index: 2;
}

.toggle-icon i {
    display: block;
    line-height: 1;
}

.sun-icon {
    left: 4px;
    color: var(--sun-color);
}

.moon-icon {
    left: 44px;
    color: var(--moon-color);
}

[data-theme="light"] .sun-icon,
[data-theme="dark"] .moon-icon,
[data-theme="girly"] .girly-icon {
    opacity: 0.98;
    transform: translateY(-50%) scale(1.02);
}

.girly-icon {
    right: 4px;
    color: var(--girly-color);
}

.girly-icon i {
    font-size: 13px;
    transform: translateY(1px);
}

@media (min-width: 481px) {
    .girly-icon i {
        transform: translate(0.8px, 1px);
    }
}

[data-theme="girly"] .girly-icon {
    color: #ffffff;
    text-shadow: 0 0 10px rgba(213, 76, 175, 0.5);
}

/* ===== Card ===== */
.card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
    margin-bottom: 16px;
    box-shadow: var(--shadow-sm);
    transition: border-color var(--transition), box-shadow var(--transition), transform var(--transition), background var(--transition);
    position: relative;
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: inherit;
    pointer-events: none;
    background: linear-gradient(180deg, var(--card-top-glow) 0%, rgba(255, 255, 255, 0) 42%);
    opacity: 0.55;
}

.card::after {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: inherit;
    pointer-events: none;
    box-shadow: inset 0 1px 0 var(--inset-stroke);
}

.card:hover {
    border-color: var(--card-hover-border);
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
}

.theme-toggle:focus-visible,
.preset-btn:focus-visible,
.number-controls button:focus-visible,
.btn-calculate:focus-visible,
.btn-reset:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

.card-label {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 16px;
}

.card-label-icon {
    font-size: 16px;
}

/* ===== Inputs ===== */
.input-group {
    display: flex;
    align-items: center;
    gap: 12px;
}

.input-wrapper {
    flex: 1;
    position: relative;
}

.input-field {
    width: 100%;
    height: 52px;
    background: var(--bg-input);
    border: 2px solid transparent;
    border-radius: var(--radius-sm);
    padding: 0 16px 0 16px;
    font-family: var(--font-family-mono);
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    transition: all var(--transition);
    outline: none;
    text-align: center;
}

.input-field-no-right-border {
    border-top-right-radius: 0px !important;
    border-bottom-right-radius: 0px !important;
}

/* Для Chrome, Safari, Edge, Opera */
.input-field::-webkit-inner-spin-button,
.input-field::-webkit-outer-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

/* Для Firefox */
.input-field {
  appearance: textfield;
}

.number-input {
  position: relative;
  display: inline-flex;
  align-items: center;
}

.number-controls {
  position: relative;
  display: flex;
  flex-direction: column;
  margin-left: -10px;
  height: 52px;
}


.number-controls button {
  background: var(--bg-input);
  border: 1px solid var(--border);
  font-size: 15px;
  line-height: 1;
  padding: 0 7px;
  flex: 1;
  min-height: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background 0.2s;
  color: var(--text-primary);
}

.number-controls button:hover {
  background: var(--bg-secondary);
  border-color: var(--accent);
}

.number-controls .inc {
    border-bottom: none;
    border-top-right-radius: var(--radius-sm);
}

.number-controls .dec {
    border-bottom-right-radius: var(--radius-sm);
}

.input-field:focus {
    border-color: var(--accent);
    background: var(--bg-secondary);
    box-shadow: 0 0 0 4px var(--accent-soft);
}

.input-field::placeholder {
    color: var(--text-tertiary);
    font-weight: 400;
}

.input-icon {
    position: absolute;
    left: 16px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 18px;
    color: var(--text-tertiary);
    pointer-events: none;
    transition: color var(--transition);
}

.input-field:focus~.input-icon {
    color: var(--accent);
}

.input-suffix {
    position: absolute;
    right: 16px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 14px;
    font-weight: 600;
    color: var(--text-tertiary);
    pointer-events: none;
}

.shift-presets {
    display: flex;
    gap: 6px;
}

.preset-btn {
    height: 52px;
    min-width: 48px;
    padding: 0 12px;
    background: var(--bg-input);
    border: 2px solid transparent;
    border-radius: var(--radius-sm);
    font-family: var(--font-family-mono);
    font-size: 16px;
    font-weight: 600;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition);
    white-space: nowrap;
}

.preset-btn:hover {
    background: var(--accent-soft);
    color: var(--accent);
    border-color: var(--accent);
}

.preset-btn.active {
    background: var(--accent);
    color: white;
    border-color: var(--accent);
}

/* ===== Action Buttons ===== */
.action-buttons {
    display: flex;
    align-items: stretch;
    gap: 10px;
}

/* ===== Calculate Button ===== */
.btn-calculate {
    flex: 1;
    height: 54px;
    border-radius: var(--radius-sm);
    background: var(--accent);
    border: none;
    color: white;
    font-family: var(--font-family-mono);
    font-size: 15px;
    font-weight: 700;
    cursor: pointer;
    transition: all var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    box-shadow: 0 4px 16px var(--accent-glow);
}

.btn-calculate:hover {
    background: var(--accent-hover);
    transform: translateY(-1px);
    box-shadow: 0 8px 24px var(--accent-glow);
}

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

.btn-calculate:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.btn-calculate.loading {
    pointer-events: none;
}

.btn-reset {
    width: 54px;
    min-width: 54px;
    height: 54px;
    border-radius: var(--radius-sm);
    border: 1px solid transparent;
    background: var(--danger-soft);
    color: var(--danger);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    transition: all var(--transition);
}

.btn-reset:hover {
    background: var(--danger);
    color: #fff;
    border-color: var(--danger);
    transform: translateY(-1px);
}

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

/* ===== Results ===== */
.results {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    pointer-events: none;
    padding-top: 3%;
    transition: max-height var(--transition), opacity var(--transition);
}

.results.visible {
    max-height: 900px;
    opacity: 1;
    pointer-events: auto;
    animation: fadeUp 0.4s ease-out;
}

@keyframes fadeUp {
    from {
        opacity: 0;
        transform: translateY(16px);
    }

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

.result-main {
    text-align: center;
    padding: 28px 24px;
    transition: background-color var(--transition), border-color var(--transition), box-shadow var(--transition);
}

.result-main.copyable {
    cursor: copy;
}

.result-main.copyable:active {
    transform: translateY(1px);
}

.result-main.copied {
    box-shadow: 0 0 0 2px var(--accent-soft), var(--shadow-sm);
}

.result-main.state-positive {
    background: var(--positive-soft);
    border-color: var(--positive);
    box-shadow: inset 0 0 0 1px rgba(34, 197, 94, 0.15);
}

.result-main.state-negative {
    background: var(--danger-soft);
    border-color: var(--danger);
    box-shadow: inset 0 0 0 1px rgba(226, 82, 82, 0.2);
}

.result-main.state-zero {
    background: var(--warning-soft);
    border-color: var(--warning);
    box-shadow: inset 0 0 0 1px rgba(213, 154, 24, 0.2);
}

.result-main-label {
    font-size: 12px;
    font-weight: 600;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.8px;
    margin-bottom: 8px;
}

.result-main-value {
    font-size: 48px;
    font-weight: 700;
    letter-spacing: -1px;
    line-height: 1.1;
    transition: color var(--transition);
}

.result-main-value.positive {
    color: var(--positive);
}

.result-main-value.negative {
    color: var(--danger);
}

.result-main-value.zero {
    color: var(--warning);
}

.result-main-sub {
    font-size: 14px;
    color: var(--text-secondary);
    margin-top: 4px;
    font-weight: 500;
}

.result-details {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
}

.result-detail-item {
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 16px;
    text-align: center;
    box-shadow: inset 0 1px 0 var(--inset-stroke);
}

.result-detail-label {
    font-size: 11px;
    font-weight: 600;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 6px;
}

.result-detail-value {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-primary);
}

.result-detail-sub {
    font-size: 12px;
    color: var(--text-tertiary);
    margin-top: 2px;
}

/* ===== Progress Bar ===== */
.progress-section {
    margin-top: 16px;
}

.progress-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 8px;
}

.progress-label {
    font-size: 12px;
    font-weight: 600;
    color: var(--text-tertiary);
}

.progress-percent {
    font-size: 12px;
    font-weight: 700;
    color: var(--accent);
}

.progress-bar {
    height: 8px;
    background: var(--bg-tertiary);
    border-radius: 4px;
    overflow: hidden;
    border: 1px solid var(--border);
    box-shadow: inset 0 1px 0 var(--inset-stroke);
}

.progress-fill {
    height: 100%;
    background: var(--accent);
    border-radius: 4px;
    transition: width 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

.progress-fill.over {
    background: var(--danger);
}

.progress-fill.complete {
    background: var(--positive);
}

/* ===== Equation ===== */
.equation {
    text-align: center;
    font-size: 15px;
    color: var(--text-secondary);
    margin-bottom: 16px;
    font-weight: 500;
    padding: 0 4px;
}

.equation span {
    font-weight: 700;
    color: var(--text-primary);
}

/* ===== Error ===== */
.error-msg {
    background: var(--danger-soft);
    color: var(--danger);
    font-size: 13px;
    font-weight: 500;
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    margin-bottom: 16px;
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    padding-top: 0;
    padding-bottom: 0;
    border-width: 0;
    border-style: solid;
    border-color: var(--danger);
    transition: max-height 0.25s ease, opacity 0.25s ease, padding 0.25s ease, border-width 0.25s ease;
}

.error-msg.visible {
    max-height: 80px;
    opacity: 1;
    padding-top: 12px;
    padding-bottom: 12px;
    border-width: 1px;
    animation: fadeUp 0.3s ease-out;
}

/* ===== Responsive ===== */
@media (max-width: 480px) {
    .app {
        padding: 16px 12px 40px;
    }

    .header {
        margin-bottom: 22px;
        padding: 0;
        align-items: flex-start;
        gap: 10px;
    }

    .header-left {
        min-width: 0;
        gap: 10px;
    }

    .header-title h1 {
        font-size: 20px;
        line-height: 1.2;
    }

    .header-title p {
        font-size: 13px;
        line-height: 1.25;
    }

    .theme-toggle {
        width: 112px;
        height: 38px;
        flex-shrink: 0;
        margin-top: 1px;
    }

    .toggle-thumb {
        top: 4px;
        left: 4px;
        width: 30px;
        height: 30px;
    }

    [data-theme="dark"] .toggle-thumb {
        transform: translateX(36px);
    }

    [data-theme="girly"] .toggle-thumb {
        transform: translateX(72px);
    }

    .toggle-icon {
        width: 30px;
        height: 30px;
    }

    .sun-icon {
        left: 4px;
    }

    .moon-icon {
        left: 40px;
    }

    .girly-icon {
        right: 7px;
    }

    .card {
        padding: 18px;
    }

    .input-field {
        font-size: 16px;
        height: 48px;
    }

    .number-controls {
        height: 48px;
    }

    .preset-btn {
        height: 48px;
        min-width: 44px;
    }

    .btn-calculate,
    .btn-reset {
        height: 50px;
    }

    .btn-reset {
        width: 50px;
        min-width: 50px;
    }

    .shift-presets {
        flex-wrap: wrap;
    }

    .result-main-value {
        font-size: 40px;
    }
}

@media (min-width: 1024px) {
    .app {
        padding: 16px 16px 24px;
    }

    .header {
        margin-bottom: 20px;
    }

    .card {
        padding: 20px;
        margin-bottom: 12px;
    }

    .results {
        padding-top: 12px;
    }
}

@media (max-width: 360px) {
    .header {
        flex-wrap: wrap;
        gap: 8px;
    }

    .header-left {
        width: 100%;
    }

    .theme-toggle {
        margin-left: auto;
    }

    .input-group {
        flex-wrap: wrap;
        gap: 8px;
    }

    .input-wrapper {
        min-width: 180px;
    }

    .shift-presets {
        width: 100%;
        display: grid;
        grid-template-columns: repeat(4, minmax(0, 1fr));
    }

    .preset-btn {
        width: 100%;
        min-width: 0;
    }

    .number-controls {
        margin-left: 0;
    }
}