/**
 * Reusable UI Components
 */

/* ============================================
   BUTTONS
   ============================================ */

.btn {
    background: linear-gradient(135deg, rgba(255, 50, 50, 0.2) 0%, rgba(255, 140, 0, 0.2) 100%);
    border: 2px solid rgba(255, 100, 100, 0.5);
    color: var(--color-text-primary);
    padding: 14px 28px;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-bold);
    transition: all var(--transition-bounce);
    text-transform: uppercase;
    letter-spacing: 1px;
    box-shadow: var(--shadow-sm);
    position: relative;
    overflow: hidden;
    font-family: inherit;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: var(--radius-full);
    background: rgba(255, 255, 255, 0.2);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn:hover::before {
    width: 300px;
    height: 300px;
}

.btn:hover {
    background: linear-gradient(135deg, rgba(255, 50, 50, 0.4) 0%, rgba(255, 140, 0, 0.4) 100%);
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
    border-color: rgba(255, 100, 100, 0.8);
}

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

.btn:disabled:hover {
    transform: none;
    box-shadow: var(--shadow-sm);
}

.btn--connected,
.btn.connected {
    background: linear-gradient(135deg, rgba(0, 255, 100, 0.3) 0%, rgba(0, 200, 255, 0.3) 100%);
    border-color: rgba(0, 255, 100, 0.6);
    box-shadow: 0 4px 20px rgba(0, 255, 100, 0.4);
}

.btn--test {
    background: linear-gradient(135deg, rgba(255, 140, 0, 0.3) 0%, rgba(255, 200, 0, 0.3) 100%);
    border-color: rgba(255, 200, 0, 0.6);
}

.btn--round {
    width: 50px;
    height: 50px;
    border-radius: var(--radius-full);
    font-size: var(--font-size-3xl);
    font-weight: var(--font-weight-black);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0;
}

.btn--round:hover {
    transform: scale(1.1);
    box-shadow: 0 0 20px rgba(255, 50, 50, 0.6);
}


/* ============================================
   CONNECTION PANEL
   ============================================ */

.connection-panel {
    background: linear-gradient(135deg, rgba(255, 50, 50, 0.1) 0%, rgba(255, 140, 0, 0.1) 100%);
    backdrop-filter: blur(20px);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
    justify-content: center;
    border: 2px solid rgba(255, 100, 100, 0.3);
    box-shadow: var(--shadow-lg), inset 0 1px 0 rgba(255, 255, 255, 0.1);
}


/* ============================================
   WORKOUT SECTION
   ============================================ */

.workout-section {
    background: linear-gradient(135deg, var(--color-bg-card) 0%, var(--color-bg-card-hover) 100%);
    backdrop-filter: blur(20px);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
    margin-bottom: var(--spacing-xl);
    border: 2px solid rgba(255, 100, 100, 0.3);
    box-shadow: var(--shadow-lg);
}


/* ============================================
   STATUS MESSAGE
   ============================================ */

.status-message {
    text-align: center;
    padding: var(--spacing-md) var(--spacing-lg);
    background: linear-gradient(135deg, rgba(255, 50, 50, 0.2) 0%, rgba(255, 140, 0, 0.2) 100%);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-xl);
    font-size: var(--font-size-base);
    border: 1px solid rgba(255, 100, 100, 0.3);
    font-weight: var(--font-weight-semibold);
    letter-spacing: 0.5px;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}


/* ============================================
   METRIC CARDS
   ============================================ */

.metrics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--grid-gap);
    margin-bottom: var(--spacing-xl);
}

.metric-card {
    background: linear-gradient(135deg, var(--color-bg-card) 0%, var(--color-bg-card-hover) 100%);
    backdrop-filter: blur(20px);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl) var(--spacing-xl);
    text-align: center;
    border: 2px solid rgba(255, 100, 100, 0.3);
    box-shadow: var(--shadow-lg), inset 0 1px 0 rgba(255, 255, 255, 0.1);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.metric-card::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: linear-gradient(45deg, transparent, rgba(255, 50, 50, 0.1), transparent);
    animation: shimmer 3s infinite;
}

.metric-card:hover {
    transform: translateY(-5px);
    border-color: rgba(255, 100, 100, 0.6);
    box-shadow: 0 12px 40px rgba(255, 50, 50, 0.3);
}

.metric-card__label {
    font-size: var(--font-size-sm);
    opacity: 0.7;
    margin-bottom: var(--spacing-md);
    text-transform: uppercase;
    letter-spacing: 2px;
    font-weight: var(--font-weight-semibold);
    color: var(--color-primary-light);
}

.metric-card__value {
    font-family: var(--font-display);
    font-size: var(--font-size-5xl);
    font-weight: var(--font-weight-black);
    line-height: 1;
    background: linear-gradient(135deg, #fff 0%, var(--color-primary-light) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: 0 0 20px rgba(255, 50, 50, 0.5);
    position: relative;
    z-index: var(--z-base);
}

.metric-card__value--small {
    font-size: var(--font-size-3xl);
}

.metric-card__unit {
    font-size: var(--font-size-xl);
    opacity: 0.6;
    margin-left: var(--spacing-xs);
    font-weight: var(--font-weight-medium);
    color: var(--color-secondary);
}

.metric-card__zone,
.metric-card__status {
    margin-top: var(--spacing-sm);
    font-size: var(--font-size-xl);
}


/* ============================================
   PHASE DISPLAY
   ============================================ */

.current-phase {
    font-family: var(--font-primary);
    font-size: var(--font-size-3xl);
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--spacing-md);
    text-align: center;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--color-primary-light);
    text-shadow: var(--shadow-glow);
}

.phase-timer {
    font-family: var(--font-display);
    font-size: var(--font-size-6xl);
    text-align: center;
    margin-bottom: var(--spacing-lg);
    font-weight: var(--font-weight-black);
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: var(--shadow-glow);
}


/* ============================================
   PROGRESS BAR
   ============================================ */

.progress-bar {
    background: rgba(0, 0, 0, 0.4);
    height: 12px;
    border-radius: var(--radius-xl);
    overflow: hidden;
    margin-bottom: var(--spacing-md);
    border: 1px solid rgba(255, 100, 100, 0.3);
    box-shadow: inset 0 2px 8px rgba(0, 0, 0, 0.5);
}

.progress-bar__fill {
    background: linear-gradient(90deg, var(--color-primary) 0%, var(--color-secondary) 50%, var(--color-accent) 100%);
    height: 100%;
    width: 0%;
    transition: width var(--transition-base), background 0.5s, box-shadow 0.5s;
    box-shadow: 0 0 15px rgba(255, 50, 50, 0.8);
    position: relative;
}

.progress-bar__fill::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    animation: progressShine 2s infinite;
}


/* ============================================
   WORKOUT CONTROLS
   ============================================ */

.workout-controls {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    margin-bottom: var(--spacing-xl);
    flex-wrap: wrap;
}

.next-phase {
    text-align: center;
    width: 100%;
}

.next-phase__label {
    font-size: var(--font-size-sm);
    opacity: 0.8;
}

.next-phase__name {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
}


/* ============================================
   WORKOUT PHASES LIST
   ============================================ */

.workout-phases {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.phase-item {
    background: linear-gradient(135deg, rgba(30, 35, 60, 0.6) 0%, rgba(20, 25, 50, 0.6) 100%);
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-left: 4px solid rgba(255, 100, 100, 0.3);
    border: 1px solid rgba(255, 100, 100, 0.2);
    transition: all var(--transition-base);
}

.phase-item:hover {
    border-left-color: var(--color-primary-light);
    transform: translateX(5px);
}

.phase-item--active,
.phase-item.active {
    background: linear-gradient(135deg, rgba(255, 50, 50, 0.3) 0%, rgba(255, 140, 0, 0.3) 100%);
    border-left-color: var(--color-primary);
    border-color: rgba(255, 100, 100, 0.5);
    box-shadow: 0 4px 20px rgba(255, 50, 50, 0.4);
    animation: activePhase 2s infinite;
}

.phase-item--completed,
.phase-item.completed {
    opacity: 0.4;
    border-left-color: rgba(0, 255, 100, 0.5);
}


/* ============================================
   SLOPE CONTROL
   ============================================ */

.slope-control {
    align-items: center;
}

.slope-display {
    font-family: var(--font-display);
    font-size: var(--font-size-3xl);
    font-weight: var(--font-weight-black);
    min-width: 150px;
    text-align: center;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    padding: var(--spacing-md) var(--spacing-lg);
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-sm);
}


/* ============================================
   TEST MODE PANEL
   ============================================ */

.test-panel {
    margin-bottom: var(--spacing-xl);
}

.test-controls {
    display: grid;
    gap: var(--spacing-xl);
}

.slider-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.slider-label {
    font-weight: var(--font-weight-semibold);
    font-size: var(--font-size-lg);
}

.slider-value {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
}

.slider-value--hr {
    color: var(--color-primary-light);
}

.slider-value--power {
    color: var(--color-secondary);
}

.slider-value--cadence {
    color: #00d4ff;
}

.slider {
    width: 100%;
    height: 8px;
    border-radius: var(--radius-sm);
    outline: none;
    cursor: pointer;
    -webkit-appearance: none;
    appearance: none;
}

.slider--hr {
    background: linear-gradient(90deg, #a8e6cf 0%, #ff5252 100%);
}

.slider--power {
    background: linear-gradient(90deg, #333 0%, var(--color-secondary) 100%);
}

.slider--cadence {
    background: linear-gradient(90deg, #333 0%, #00d4ff 100%);
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: var(--radius-full);
    background: var(--color-text-primary);
    cursor: pointer;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.3);
}

.slider::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: var(--radius-full);
    background: var(--color-text-primary);
    cursor: pointer;
    border: none;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.3);
}

.quick-buttons {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.quick-buttons .btn {
    flex: 1;
    min-width: 150px;
}


/* ============================================
   HR ZONE INDICATOR
   ============================================ */

.hr-zone-indicator {
    display: inline-block;
    width: 15px;
    height: 15px;
    border-radius: var(--radius-full);
    margin-left: var(--spacing-sm);
    animation: hrPulse 1s infinite;
    box-shadow: 0 0 10px currentColor;
}